參數(shù)資料
型號： R5F6418JADFE
元件分類： 微控制器/微處理器
英文描述： MICROCONTROLLER, PQFP176
封裝： 24 X 24 MM, 0.50 MM PITCH, PLASTIC, LQFP-176
文件頁數(shù)： 93/128頁
文件大?。?/td> 922K
代理商： R5F6418JADFE
67
ATmega48PA/88PA/168PA [DATASHEET]
9223F–AVR–04/14
When reading back a software assigned pin value, a nope instruction must be inserted as indicated in Figure 14-4. The out
instruction sets the “SYNC LATCH” signal at the positive edge of the clock. In this case, the delay tpd through the
synchronizer is 1 system clock period.
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 previously discussed,
a nope instruction is included to be able to read back the value recently assigned to some of the pins.
Assembly Code Example(1)
...
; 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;
...
Note:
1.
For the assembly program, two temporary registers are used to minimize the time from pull-ups are set on
pins 0, 1, 6, and 7, until the direction bits are correctly set, defining bit 2 and 3 as low and redefining bits 0
and 1 as strong high drivers.
SYSTEM CLK
INSTRUCTIONS
SYNC LATCH
PINxn
r16
r17
out PORTx, r16
nop
0x00
0xFF
in r17, PINx
t
pd
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