;*********************************************************************
;
; 
; Controller  AT90S1200
; 
; Definitions for various registers and bits
; for generic program 
;
; Adapted from Atmel code
; Richard Hosking 
; Rev 1
; 27/12/99
;
;***** Specify Device
.device AT90S1200
;***** I/O Register Definitions
.equ    SREG    =$3f            ; Status register
.equ    GIMSK   =$3b            ;General Interrupt mask register
.equ    TIMSK   =$39            ;Timer/counter interrupt mask register 
.equ    TIFR    =$38            ;Timer/counter interrupt flag register
.equ    MCUCR   =$35            ;MCU control register
.equ    TCCR0   =$33            ;Timer/counter control register 
.equ    TCNT0   =$32            ;Timer/counter
.equ    WDTCR   =$21            ;Watcdog control reg
.equ    EEAR    =$1e            ;EEPROM address reg
.equ    EEDR    =$1d            ;EEPROM data reg
.equ    EECR    =$1c            ;EEPROM control reg
.equ    PORTB   =$18            ;Port B
.equ    DDRB    =$17            ; Port B data direction reg 1=out 0=in
.equ    PINB    =$16            ;Port B input pins direct
.equ    PORTD   =$12            ;Port D
.equ    DDRD    =$11            ;
.equ    PIND    =$10            ;
.equ    ACSR    =$08            ; Analog comparator control/status reg
;***** Bit Definitions
; STATUS REG
.equ    GIE     =7              ; Global Interupt Enable in STATUS reg
.equ    BCS     =6              ; Bit Copy Storage - bld command (bit load)
                                ; writes a specified bit from a register
                                ; to this bit - bst (bit store) writes this bit 
                                ; to the specified register
.equ    H       =5              ; Half carry flag
.equ    HALF_CARRY =5
.equ    S       =4              ; Sign bit
.equ    V       =3              ; Twos complement overflow flag
.equ    N       =2              ; Negative flag
.equ    NEG     =2
.equ    Z       =1              ; Zero flag
.equ    ZERO    =1
.equ    C       =0              ; Carry flag
.equ    CARRY   =0
;*************
.equ    INT0    =6              ; Ext interrupt D6
.equ    TOIE0   =1              ;Timer/counter overflow interrupt enable
                                ; bit 1 in TIMSK enable high
.equ    TOV0    =1              ; Timer/counter overflow flag bit 1 in TIFR     
                                ; high = overflow       
.equ    SE      =5              ; Sleep enable (1) in MCUCR
.equ    SM      =4              ; Sleep mode 0=idle 1= power down in MCUCR
.equ    ISC01   =1              ; Interrupt sense control in MCUCR
.equ    ISC00   =0              ; 00 INT0 low generates interrupt
                                ; 01 reserved
                                ; 10 falling edge of INT0 -> interrupt
                                ; 11 rising edge of INT0 -> interrupt
.equ    CS02    =2              ; CS00-CS02 Clock select bits for timer
.equ    CS01    =1              ; Set prescaler/ clock source
.equ    CS00    =0              ; (prescaler/external source)
.equ    WDE     =3              ; In watchdog control reg Watchdog enable (1)
.equ    WDP2    =2              ; WDP0-WDP2 in watchdog control reg
.equ    WDP1    =1              ; set watchdog timeout approx 16-2000 msec
.equ    WDP0    =0
.equ    EEWE    =1              ; EEPROM write enable bit in EECR set to write data
                                ; cleared by hardware when write cycle complete (2.5 ms)
.equ    EERE    =0              ; EEPROM read enable set to read data
                                ; when bit is cleared by hardware requested data is in EEDR
.equ    ACD     =7              ; Analog comparator disable in ACSR 1= comparator off
.equ    ACO     =5              ; Analog comparator output
.equ    ACI     =4              ; Analaog comparator interrupt flag 
.equ    ACIE    =3              ; Analog comparator interrupt enable 1= enabled
.equ    ACIS1   =1              ; ACIS0-ACIS1 AC interrupt mode select
.equ    ACIS0   =0
.equ    INT0addr=$001           ;External Interrupt0 Vector Address
.equ    OVF0addr=$002           ;Overflow0 Interrupt Vector Address
.equ    ACIaddr =$003           ;Analog Comparator Interrupt Vector Address