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参数资料
| 型号： | R5F2138CFJFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | FLASH, 20 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件页数： | 6/30页 |
| 文件大小： | 483K |
| 代理商： | R5F2138CFJFP |
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ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]
8285E–AVR–02/2013
Figure 14-4. Synchronization when reading a software assigned pin value.
The following code example shows how to set port B pins 0 and 1 high, 2 and 3 low, and define the port pins from
4 to 7 as input with pull-ups assigned to port pins 6 and 7. The resulting pin values are read back again, but as pre-
viously discussed, a nop instruction is included to be able to read back the value recently assigned to some of the
pins.
Assembly code example
...
; Define pull-ups and set outputs high
; Define directions for port pins
ldi
r16,(1<<PB7)|(1<<PB6)|(1<<PB1)|(1<<PB0)
ldi
r17,(1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0)
out
PORTB,r16
out
DDRB,r17
; Insert nop for synchronization
nop
; Read port pins
in
r16,PINB
...
C code example
unsigned char
i;
...
/* Define pull-ups and set outputs high */
/* Define directions for port pins */
PORTB = (1<<PB7)|(1<<PB6)|(1<<PB1)|(1<<PB0);
DDRB = (1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0);
/* Insert nop for synchronization*/
__no_operation();
/* Read port pins */
i = PINB;
...
out PORTx, r16
nop
in r17, PINx
0xFF
0x00
0xFF
SYSTEM CLK
r16
INSTRUCTIONS
SYNC LATCH
PINxn
r17
t
pd
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