Rainbow-electronics ATmega163L Uživatelský manuál stáhnout pdf (Strana 80)

ATmega163(L)

wait6: in r16,TWCR ; Wait for TWINT flag set. This indicates that

sbrs r16, TWINT ; SLA+R has been transmitted, and ACK/NACK has

rjmp wait6 ; been received

in r16, TWSR ; Check value of TWI Status Register. If status

cpi r16, MR_SLA_ACK ; different from MR_SLA_ACK, go to ERROR

brne ERROR

ldi r16, (1<<TWINT) | (1<<TWEA) | (1<<TWEN)

out TWCR, r16 ; Clear TWINT bit in TWCR to start reception of data.

; Setting TWEA causes ACK to be

; returned after reception of data byte

wait7: in r16,TWCR ; Wait for TWINT flag set. This indicates that

sbrs r16, TWINT ; data has been received and ACK returned

rjmp wait7

in r16, TWSR ; Check value of TWI Status Register. If status

cpi r16, MR_DATA_ACK ; different from MR_DATA_ACK, go to ERROR

brne ERROR

in r16, TWDR ; Input received data from TWDR.

nop ;<do something with received data>

ldi r16, (1<<TWINT) | (1<<TWEA) | (1<<TWEN)

out TWCR, r16 ; Clear TWINT bit in TWCR to start reception

; of data. Setting TWEA causes ACK to be

; returned after reception of data byte

;<Receive more data bytes if needed>

;receive next to last data byte.

wait8: in r16,TWCR ; Wait for TWINT flag set. This indicates that

sbrs r16, TWINT ; data has been received and ACK returned

rjmp wait8

in r16, TWSR ; Check value of TWI Status Register. If status

cpi r16, MR_DATA_ACK ; different from MR_DATA_ACK, go to ERROR

brne ERROR

in r16, TWDR ; Input received data from TWDR.

nop ;<do something with received data>

ldi r16, (1<<TWINT) | (1<<TWEN)

out TWCR, r16 ; 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

wait9: in r16,TWCR ; Wait for TWINT flag set. This indicates that

sbrs r16, TWINT ; data has been received and NACK returned

rjmp wait9

in r16, TWSR ; Check value of TWI Status Register. If status

cpi r16, MR_DATA_NACK ; different from MR_DATA_NACK, go to ERROR

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Rainbow-electronics ATmega163L Uživatelský manuál Strana 80

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