ATMEGA163 ATMEL [ATMEL Corporation], ATMEGA163 Datasheet - Page 94

• Manufacturer Part Number: ATMEGA163
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

94
ATmega163(L)
wait9:in
nop
sbrs
rjmp
in
cpi
brne
in
ldi
out
sbrs
rjmp
in
cpi
brne
in
nop
ldi
out
r16, TWINT
wait8
r16, TWSR
r16, MR_DATA_ACK ; different from MR_DATA_ACK, go to ERROR
ERROR
r16, TWDR
r16, (1<<TWINT) | (1<<TWEN)
TWCR, r16
r16,TWCR
r16, TWINT
wait9
r16, TWSR
r16, MR_DATA_NACK ; different from MR_DATA_NACK, go to ERROR
ERROR
r16, TWDR
r16, (1<<TWINT) | (1<<TWSTO) | (1<<TWEN)
TWCR, r16
; 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
; receive last data byte. Signal this to slave by
; returning NACK
; 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>
; Send STOP signal
1142E–AVR–02/03