參數(shù)資料
型號: HD40A4054
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 72/101頁
文件大小: 610K
代理商: HD40A4054
HD404054 Series/HD404094 Series
72
Bit
Initial value
Read/Write
Bit name
3
0
W
SM1A3
2
0
W
SM1A2
0
0
W
SM1A0
1
0
W
SM1A1
Serial mode register 1A (SM1A: $005)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SM1A2
SM
SM1A1
SM1A3
0
1
1
/
SCK
1
R4
R4
1
SCK
1
SCK
1
Output
Output
Input
Clock source
Prescaler
System clock
External clock
division ratio
Figure 53 Serial Mode Register 1A (SM1A)
Serial Mode Register 1B (SM1B: $028):
This register has the following functions (figure 54).
Serial interface 1 prescaler division ratio selection
Serial interface 1 output level control in idle states
Serial mode register 1B (SM1B: $028) is a 2-bit write-only register. It cannot be written during data
transfer.
By setting bit 0 (SM1B0) of this register, the serial interface 1 prescaler division ratio is selected. Only bit
0 (SM1B0) can be reset to 0 by MCU reset. By setting bit 1 (SM1B1), the output level of the SO
1
pin is
controlled in idle states of serial interface 1. The output level changes at the same time that SM1B1 is
written to.
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