atmega163l ATMEL Corporation, atmega163l Datasheet - Page 97

• Manufacturer Part Number: atmega163l
• Description: Atmega163 8-bit Avr Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

1142E–AVR–02/03
wait12:in
wait13:in
;<Wait for next data transmission or do something else>
sbrs
rjmp
in
cpi
brne
in
nop
ldi
out
sbrs
rjmp
in
cpi
brne
in
nop
ldi
out
r16, TWINT
wait12
r16, TWSR
r16, SR_DATA_ACK ; different from SR_DATA_ACK, go to ERROR
ERROR
r16, TWDR
r16, (1<<TWINT) | (1<<TWEN)
TWCR, r16
r16,TWCR
r16, TWINT
wait13
r16, TWSR
r16, SR_DATA_NACK ; different from SR_DATA_NACK, go to ERROR
ERROR
r16, TWDR
r16, (1<<TWINT) | (1<<TWEA) | (1<<TWEN)
TWCR, r16
r16,TWCR
; ACK should be returned after receiving first
; data byte
; Wait for TWINT flag set. This indicates that
; data has been received and ACK returned
; Check value of TWI Status Register. If status
; Input received data from TWDR.
;<do something with received data>
; Clear TWINT bit in TWCR to start reception of
; data. Not setting TWEA causes NACK to be
; returned after reception of next data byte
; Wait for TWINT flag set. This indicates that
; data has been received and NACK returned
; Check value of TWI Status Register. If status
; Input received data from TWDR.
;<do something with received data>
; Clear TWINT bit in TWCR to start reception of
; data. Setting TWEA causes TWI unit to enter
; not addressed slave mode with reckognition of
; own SLA
ATmega163(L)
97