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ATmega16HVB 数据表(PDF) 167 Page - ATMEL Corporation

部件名 ATmega16HVB
功能描述  8-bit Microcontroller with 16K/32K Bytes In-System Programmable Flash
PDF  273 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

ATmega16HVB 数据表(HTML) 167 Page - ATMEL Corporation

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167
8042A–AVR–07/09
ATmega16HVB/32HVB
Note:
1. See ”About Code Examples” on page 8.
Assembly code example(1)
C example(1)
Comments
1
ldi
r16,
(1<<TWINT)|(1<<TWSTA)|
(1<<TWEN)
out
TWCR, r16
TWCR = (1<<TWINT)|(1<<TWSTA)|
(1<<TWEN)
Send START condition
2
wait1:
in
r16,TWCR
sbrs
r16,TWINT
rjmp
wait1
while
(!(TWCR & (1<<TWINT)))
;
Wait for TWINT flag set. This
indicates that the START
condition has been transmitted
3
in
r16,TWSR
andi
r16, 0xF8
cpi
r16, START
brne
ERROR
if
((TWSR & 0xF8) != START)
ERROR();
Check value of TWI Status
Register. Mask prescaler bits. If
status different from START go to
ERROR
4
ldi
r16, SLA_W
out
TWDR, r16
ldi
r16, (1<<TWINT) |
(1<<TWEN)
out
TWCR, r16
TWDR = SLA_W;
TWCR = (1<<TWINT) |
(1<<TWEN);
Load SLA_W into TWDR
Register. Clear TWINT bit in
TWCR to start transmission of
address
wait2:
in
r16,TWCR
sbrs
r16,TWINT
rjmp
wait2
while
(!(TWCR & (1<<TWINT)))
;
Wait for TWINT flag set. This
indicates that the SLA+W has
been transmitted, and
ACK/NACK has been received.
5
in
r16,TWSR
andi
r16, 0xF8
cpi
r16, MT_SLA_ACK
brne
ERROR
if
((TWSR & 0xF8) !=
MT_SLA_ACK)
ERROR();
Check value of TWI Status
Register. Mask prescaler bits. If
status different from
MT_SLA_ACK go to ERROR
ldi
r16, DATA
out
TWDR, r16
ldi
r16, (1<<TWINT) |
(1<<TWEN)
out
TWCR, r16
TWDR = DATA;
TWCR = (1<<TWINT) |
(1<<TWEN);
Load DATA into TWDR Register.
Clear TWINT bit in TWCR to
start transmission of data
6
wait3:
in
r16,TWCR
sbrs
r16,TWINT
rjmp
wait3
while
(!(TWCR & (1<<TWINT)))
;
Wait for TWINT flag set. This
indicates that the DATA has been
transmitted, and ACK/NACK has
been received.
7
in
r16,TWSR
andi
r16, 0xF8
cpi
r16, MT_DATA_ACK
brne
ERROR
if
((TWSR & 0xF8) !=
MT_DATA_ACK)
ERROR();
Check value of TWI Status
Register. Mask prescaler bits. If
status different from
MT_DATA_ACK go to ERROR
ldi
r16,
(1<<TWINT)|(1<<TWEN)|
(1<<TWSTO)
out
TWCR, r16
TWCR = (1<<TWINT)|(1<<TWEN)|
(1<<TWSTO);
Transmit STOP condition



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