PIC16F87XA
28/40/44-Pin Enhanced Flash Microcontrollers
Devices Included in this Data Sheet:
• PIC16F873A
• PIC16F874A
• PIC16F876A
• PIC16F877A
Analog Features:
• 10-bit, up to 8-channel Analog-to-Digital
Converter (A/D)
• Brown-out Reset (BOR)
• Analog Comparator module with:
- Two analog comparators
- Programmable on-chip voltage reference
(V
REF
) module
- Programmable input multiplexing from device
inputs and internal voltage reference
- Comparator outputs are externally accessible
High-Performance RISC CPU:
• Only 35 single-word instructions to learn
• All single-cycle instructions except for program
branches, which are two-cycle
• Operating speed: DC – 20 MHz clock input
DC – 200 ns instruction cycle
• Up to 8K x 14 words of Flash Program Memory,
Up to 368 x 8 bytes of Data Memory (RAM),
Up to 256 x 8 bytes of EEPROM Data Memory
• Pinout compatible to other 28-pin or 40/44-pin
PIC16CXXX and PIC16FXXX microcontrollers
Special Microcontroller Features:
• 100,000 erase/write cycle Enhanced Flash
program memory typical
• 1,000,000 erase/write cycle Data EEPROM
memory typical
• Data EEPROM Retention > 40 years
• Self-reprogrammable under software control
• In-Circuit Serial Programming™ (ICSP™)
via two pins
• Single-supply 5V In-Circuit Serial Programming
• Watchdog Timer (WDT) with its own on-chip RC
oscillator for reliable operation
• Programmable code protection
• Power saving Sleep mode
• Selectable oscillator options
• In-Circuit Debug (ICD) via two pins
Peripheral Features:
• Timer0: 8-bit timer/counter with 8-bit prescaler
• Timer1: 16-bit timer/counter with prescaler,
can be incremented during Sleep via external
crystal/clock
• Timer2: 8-bit timer/counter with 8-bit period
register, prescaler and postscaler
• Two Capture, Compare, PWM modules
- Capture is 16-bit, max. resolution is 12.5 ns
- Compare is 16-bit, max. resolution is 200 ns
- PWM max. resolution is 10-bit
• Synchronous Serial Port (SSP) with SPI
(Master mode) and I
2
C™
(Master/Slave)
• Universal Synchronous Asynchronous Receiver
Transmitter (USART/SCI) with 9-bit address
detection
• Parallel Slave Port (PSP) – 8 bits wide with
external RD, WR and CS controls (40/44-pin only)
• Brown-out detection circuitry for
Brown-out Reset (BOR)
CMOS Technology:
• Low-power, high-speed Flash/EEPROM
technology
• Fully static design
• Wide operating voltage range (2.0V to 5.5V)
• Commercial and Industrial temperature ranges
• Low-power consumption
Device
MSSP
Data
EEPROM
10-bit
CCP
Timers
# Single Word SRAM (Bytes) I/O A/D (ch) (PWM)
Master USART 8/16-bit Comparators
Bytes
SPI
Instructions (Bytes)
I
2
C
7.2K
7.2K
4096
4096
8192
8192
192
192
368
368
128
128
256
256
22
33
22
33
5
8
5
8
2
2
2
2
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
2/1
2/1
2/1
2/1
2
2
2
2
Program Memory
PIC16F873A
PIC16F874A
PIC16F876A 14.3K
PIC16F877A 14.3K
2001-2013 Microchip Technology Inc.
DS39582C-page 1
PIC16F87XA
Pin Diagrams
28-Pin PDIP, SOIC, SSOP
MCLR/V
PP
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-/CV
REF
RA3/AN3/V
REF
+
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
V
SS
OSC1/CLKI
OSC2/CLKO
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RB7/PGD
RB6/PGC
RB5
RB4
RB3/PGM
RB2
RB1
RB0/INT
V
DD
V
SS
RC7/RX/DT
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
PIC16F873A/876A
28-Pin QFN
RA2/AN2/V
REF
-/CV
REF
RA3/AN3/V
REF
+
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
V
SS
OSC1/CLKI
OSC2/CLKO
1
2
3
4
5
6
7
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RA1/AN1
RA0/AN0
MCLR/V
PP
RB7/PGD
RB6/PGC
RB5
RB4
PIC16F873A
PIC16F876A
44-Pin QFN
44
43
42
41
40
39
38
37
36
35
34
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
RD3/PSP3
RD2/PSP2
RD1/PSP1
RD0/PSP0
RC3/SCK/SCL
RC2/CCP1
RC1/T1OSI/CCP2
RC0/T1OSO/T1CKI
RB3/PGM
NC
RB4
RB5
RB6/PGC
RB7/PGD
MCLR/V
PP
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-/CV
REF
RA3/AN3/V
REF
+
12
13
14
15
16
17
18
19
20
21
22
RC7/RX/DT
RD4/PSP4
RD5/PSP5
RD6/PSP6
RD7/PSP7
V
SS
V
DD
V
DD
RB0/INT
RB1
RB2
1
2
3
4
5
6
7
8
9
10
11
PIC16F874A
PIC16F877A
33
32
31
30
29
28
27
26
25
24
23
OSC2/CLKO
OSC1/CLKI
V
SS
V
SS
V
DD
V
DD
RE2/CS/AN7
RE1/WR/AN6
RE0/RD/AN5
RA5/AN4/SS/C2OUT
RA4/T0CKI/C1OUT
DS39582C-page 2
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
8
9
10
11
12
13
14
RB3/PGM
RB2
RB1
RB0/INT
V
DD
V
SS
RC7/RX/DT
2001-2013 Microchip Technology Inc.
PIC16F87XA
Pin Diagrams (Continued)
40-Pin PDIP
MCLR/V
PP
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-/CV
REF
RA3/AN3/V
REF
+
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
RE0/RD/AN5
RE1/WR/AN6
RE2/CS/AN7
V
DD
V
SS
OSC1/CLKI
OSC2/CLKO
RC0/T1OSO/T1CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RD0/PSP0
RD1/PSP1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
RB7/PGD
RB6/PGC
RB5
RB4
RB3/PGM
RB2
RB1
RB0/INT
V
DD
V
SS
RD7/PSP7
RD6/PSP6
RD5/PSP5
RD4/PSP4
RC7/RX/DT
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
RD3/PSP3
RD2/PSP2
PIC16F874A/877A
44-Pin PLCC
RA4/T0CKI/C1OUT
RA5/AN4/SS/C2OUT
RE0/RD/AN5
RE1/WR/AN6
RE2/CS/AN7
V
DD
V
SS
OSC1/CLKI
OSC2/CLKO
RC0/T1OSO/T1CK1
NC
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
RD3/PSP3
RD2/PSP2
RD1/PSP1
RD0/PSP0
RC3/SCK/SCL
RC2/CCP1
RC1/T1OSI/CCP2
NC
6
5
4
3
2
1
44
43
42
41
40
7
8
9
10
11
12
13
14
15
16
17
39
38
37
36
35
34
33
32
31
30
9
RB3/PGM
RB2
RB1
RB0/INT
V
DD
V
SS
RD7/PSP7
RD6/PSP6
RD5/PSP5
RD4/PSP4
RC7/RX/DT
44-Pin TQFP
44
43
42
41
40
39
38
37
36
35
34
2001-2013 Microchip Technology Inc.
NC
NC
RB4
RB5
RB6/PGC
RB7/PGD
MCLR/V
PP
RA0/AN0
RA1/AN1
RA2/AN2/V
REF
-/CV
REF
RA3/AN3/V
REF
+
12
13
14
15
16
17
18
19
20
21
22
RC7/RX/DT
RD4/PSP4
RD5/PSP5
RD6/PSP6
RD7/PSP7
V
SS
V
DD
RB0/INT
RB1
RB2
RB3/PGM
1
2
3
4
5
6
7
8
9
10
11
PIC16F874A
PIC16F877A
33
32
31
30
29
28
27
26
25
24
23
NC
RC0/T1OSO/T1CKI
OSC2/CLKO
OSC1/CLKI
V
SS
V
DD
RE2/CS/AN7
RE1/WR/AN6
RE0/RD/AN5
RA5/AN4/SS/C2OUT
RA4/T0CKI/C1OUT
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RD0/PSP0
RD1/PSP1
RD2/PSP2
RD3/PSP3
RC4/SDI/SDA
RC5/SDO
RC6/TX/CK
NC
18
19
20
21
22
23
24
25
26
27
282
RA3/AN3/V
REF
+
RA2/AN2/V
REF
-/CV
REF
RA1/AN1
RA0/AN0
MCLR/V
PP
NC
RB7/PGD
RB6/PGC
RB5
RB4
NC
PIC16F874A
PIC16F877A
DS39582C-page 3
PIC16F87XA
Table of Contents
1.0 Device Overview ......................................................................................................................................................................... 5
2.0 Memory Organization................................................................................................................................................................ 15
3.0 Data EEPROM and Flash Program Memory ............................................................................................................................ 33
4.0 I/O Ports.................................................................................................................................................................................... 41
5.0 Timer0 Module .......................................................................................................................................................................... 53
6.0 Timer1 Module .......................................................................................................................................................................... 57
7.0 Timer2 Module .......................................................................................................................................................................... 61
8.0 Capture/Compare/PWM Modules ............................................................................................................................................. 63
9.0 Master Synchronous Serial Port (MSSP) Module..................................................................................................................... 71
10.0 Addressable Universal Synchronous Asynchronous Receiver Transmitter (USART) ............................................................ 111
11.0 Analog-to-Digital Converter (A/D) Module .............................................................................................................................. 127
12.0 Comparator Module ................................................................................................................................................................ 135
13.0 Comparator Voltage Reference Module ................................................................................................................................. 141
14.0 Special Features of the CPU .................................................................................................................................................. 143
15.0 Instruction Set Summary......................................................................................................................................................... 159
16.0 Development Support ............................................................................................................................................................. 167
17.0 Electrical Characteristics......................................................................................................................................................... 173
18.0 DC and AC Characteristics Graphs and Tables ..................................................................................................................... 197
19.0 Packaging Information ............................................................................................................................................................ 209
Appendix A: Revision History ............................................................................................................................................................ 219
Appendix B: Device Differences........................................................................................................................................................ 219
Appendix C: Conversion Considerations........................................................................................................................................... 220
Index ................................................................................................................................................................................................. 221
On-Line Support................................................................................................................................................................................ 229
Systems Information and Upgrade Hot Line ..................................................................................................................................... 229
Reader Response ............................................................................................................................................................................. 230
PIC16F87XA Product Identification System...................................................................................................................................... 231
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The last character of the literature number is the version number, (e.g., DS30000A is version A of document DS30000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
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DS39582C-page 4
2001-2013 Microchip Technology Inc.
PIC16F87XA
1.0
DEVICE OVERVIEW
This document contains device specific information
about the following devices:
•
•
•
•
PIC16F873A
PIC16F874A
PIC16F876A
PIC16F877A
The available features are summarized in Table 1-1.
Block diagrams of the PIC16F873A/876A and
PIC16F874A/877A devices are provided in Figure 1-1
and Figure 1-2, respectively. The pinouts for these
device families are listed in Table 1-2 and Table 1-3.
Additional information may be found in the PIC
®
Mid-
Range Reference Manual (DS33023), which may be
obtained from your local Microchip Sales Representative
or downloaded from the Microchip web site. The Refer-
ence Manual should be considered a complementary
document to this data sheet and is highly recommended
reading for a better understanding of the device architec-
ture and operation of the peripheral modules.
PIC16F873A/876A devices are available only in 28-pin
packages, while PIC16F874A/877A devices are avail-
able in 40-pin and 44-pin packages. All devices in the
PIC16F87XA family share common architecture with
the following differences:
• The PIC16F873A and PIC16F874A have one-half
of the total on-chip memory of the PIC16F876A
and PIC16F877A
• The 28-pin devices have three I/O ports, while the
40/44-pin devices have five
• The 28-pin devices have fourteen interrupts, while
the 40/44-pin devices have fifteen
• The 28-pin devices have five A/D input channels,
while the 40/44-pin devices have eight
• The Parallel Slave Port is implemented only on
the 40/44-pin devices
TABLE 1-1:
PIC16F87XA DEVICE FEATURES
PIC16F873A
DC – 20 MHz
POR, BOR
(PWRT, OST)
4K
192
128
14
Ports A, B, C
3
2
MSSP, USART
—
5 input channels
2
35 Instructions
28-pin PDIP
28-pin SOIC
28-pin SSOP
28-pin QFN
PIC16F874A
DC – 20 MHz
POR, BOR
(PWRT, OST)
4K
192
128
15
Ports A, B, C, D, E
3
2
MSSP, USART
PSP
8 input channels
2
35 Instructions
40-pin PDIP
44-pin PLCC
44-pin TQFP
44-pin QFN
PIC16F876A
DC – 20 MHz
POR, BOR
(PWRT, OST)
8K
368
256
14
Ports A, B, C
3
2
MSSP, USART
—
5 input channels
2
35 Instructions
28-pin PDIP
28-pin SOIC
28-pin SSOP
28-pin QFN
PIC16F877A
DC – 20 MHz
POR, BOR
(PWRT, OST)
8K
368
256
15
Ports A, B, C, D, E
3
2
MSSP, USART
PSP
8 input channels
2
35 Instructions
40-pin PDIP
44-pin PLCC
44-pin TQFP
44-pin QFN
Key Features
Operating Frequency
Resets (and Delays)
Flash Program Memory
(14-bit words)
Data Memory (bytes)
EEPROM Data Memory (bytes)
Interrupts
I/O Ports
Timers
Capture/Compare/PWM modules
Serial Communications
Parallel Communications
10-bit Analog-to-Digital Module
Analog Comparators
Instruction Set
Packages
2001-2013 Microchip Technology Inc.
DS39582C-page 5
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