參數(shù)資料
型號(hào): HMS77C2000
英文描述: [General Purpose(2) : ADC/ LED/ SCI/ PWM]
中文描述: [通用(2):藝術(shù)發(fā)展局/發(fā)光/工商/脈寬調(diào)制]
文件頁(yè)數(shù): 31/59頁(yè)
文件大?。?/td> 660K
代理商: HMS77C2000
HMS77C2000/2001
28
Nov. 2002 Ver 1.1
FIGURE 10-2 SUCCESSIVE I/O OPERATION
MOVWF UPIO
PC
UP5:UP0
Instruction
fetched
This example shows a write
to UPIO followed by a read
from UPIO.
Data setup time = (0.25 T
-T
PD
)
where: T
CY
= instruction cycle
T
= propagation delay
Therefore, at higher clock frequenies,
a write followed by a read may be
problematic.
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC+1
PC+2
PC+3
MOVF UPIO,W
NOP
NOP
Port pin
written here
Port pin
sampled here
Instruction
executed
MOVWF UPIO
(Write to UPIO)
MOVF UPIO,W
(Read UPIO)
NOP
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