參數(shù)資料
型號: HCD40C4344R
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微電腦(4位單片微計算機)
文件頁數(shù): 68/100頁
文件大小: 610K
代理商: HCD40C4344R
HD404344R Series/HD404394 Series
68
Bit
Initial value
Read/Write
Bit name
3
0
W
SMR3
2
0
W
SMR2
0
0
W
SMR0
1
0
W
SMR1
Serial mode register (SMR: $005)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SMR2
S
SMR1
SMR3
0
1
R0
0
/
SCK
Mode Selection
R0
0
SCK
SCK
Output
Output
Input
Clock Source
External clock
Division Ratio
Prescaler
System clock
Figure 45 Serial Mode Register (SMR)
Port Mode Register C (PMRC: $025):
This register has the following functions:
Prescaler division ratio selection
Output level control during idle states
Port mode register C is a two-bit write-only register, which cannot be changed during data transfer.
Bit 0 (PMRC0) selects the prescaler division ratio. Only this bit is reset to 0 by an MCU reset.
Bit 1 enables the output level control of the SO pin during an idle state. The output levels at the pins are
therefore changed when writing to bit 1 (PMRC1).
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