參數(shù)資料
型號: HD404358H
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機
文件頁數(shù): 68/100頁
文件大?。?/td> 398K
代理商: HD404358H
HD404358 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
SMR0
SMR1
SMR3
0
1
R0
0
/
SCK
Mode Selection
R0
0
SCK
SCK
Output
Output
Input
Clock Source
External clock
Prescaler
Division Ratio
Refer to
table 28
Prescaler
System clock
Figure 55 Serial Mode Register (SMR)
Port Mode Register C (PMRC: $025):
This register has the following functions (figure 56).
Prescaler division ratio selection
Output level control in idle states
Port mode register C (PMRC: $025) is a 4-bit write-only register. It cannot be written during data transfer.
By setting bit 0 (PMRC0) of this register, the prescaler division ratio is selected. Bit 0 (PMRC0) can be
reset to 0 by MCU reset. By setting bit 1 (PMRC1), the output level of the SO pin is controlled in idle
states. The output level changes at the same time that PMRC1 is written to.
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