參數(shù)資料
型號(hào): PIC12CR509A
廠商: Microchip Technology Inc.
英文描述: 8-Pin, 8-Bit CMOS Microcontrollers
中文描述: 8引腳,8位CMOS微控制器
文件頁數(shù): 23/113頁
文件大小: 1604K
代理商: PIC12CR509A
1999 Microchip Technology Inc.
DS40139E-page 23
PIC12C5XX
FIGURE 5-2:
SUCCESSIVE I/O OPERATION
PC
PC + 1
PC + 2
PC + 3
Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4 Q1
Q2
Q3 Q4
Q1
Q2
Q3 Q4
Instruction
fetched
GP5:GP0
MOVWF GPIO
NOP
Port pin
NOP
MOVF GPIO,W
Instruction
executed
MOVWF GPIO
(Write to
GPIO)
NOP
MOVF GPIO,W
(Read
GPIO)
This example shows a write to GPIO followed
by a read from GPIO.
Data setup time = (0.25 T
CY
– T
PD
)
where: T
CY
= instruction cycle.
T
PD
= propagation delay
Therefore, at higher clock frequencies, a
write followed by a read may be problematic.
Port pin
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