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參數(shù)資料
| 型號(hào)： | HD404638R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī)) |
| 中文描述： | 4位單片機(jī)（4位單片微計(jì)算機(jī)） |
| 文件頁(yè)數(shù)： | 90/133頁(yè) |
| 文件大?。?/td> | 803K |
| 代理商： | HD404638R |
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HD404639R Series
90
A write signal input to serial mode register 1A discontinues the input of the transmit clock to serial data
register 1 (SR1L: $006, SR1U: $007) and the octal counter, and the octal counter is reset to 000. Therefore,
if a write is performed during data transfer, the serial 1 interrupt request flag (IFS1: $003, bit 2) is set.
Written data is valid from the second instruction execution cycle after the write operation, so the STS
instruction must be executed at least two cycles after that.
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
Refer to
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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404638RF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404639R | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404639RF | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404639RSERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD404652 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
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