參數(shù)資料
型號: HD4074449
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系列微機(4位單片微計算機)
文件頁數(shù): 89/123頁
文件大?。?/td> 726K
代理商: HD4074449
HD404449 Series
89
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 70 Serial Mode Register 1A (SM1A)
Serial Mode Register 1B (SM1B: $028):
This register has the following functions (figure 71).
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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相關代理商/技術(shù)參數(shù)
參數(shù)描述
HD4074449H 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
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