AVR单片机中 寄存器定义如下，请教分别是什么寄存器：
- ;***** I/O Register Definitions
- .equ SREG =$3F；状态寄存器？
- .equ SPH =$3E
- .equ SPL =$3D
- .equ EEARH =$1F
- .equ EEARL =$1E
- .equ EEDR =$1D
- .equ EECR =$1C
- .equ PORTA =$1B
- .equ DDRA =$1A
- .equ PINA =$19
- .equ PORTB =$18
- .equ DDRB =$17
- .equ PINB =$16
- .equ PORTC =$15
- .equ DDRC =$14
- .equ PINC =$13
- .equ PORTD =$12
- .equ DDRD =$11
- .equ PIND =$10
- .def XL =r26
- .def XH =r27
- .def YL =r28
- .def YH =r29
- .def ZL =r30
- .def ZH =r31
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