參數(shù)資料
型號(hào): HD40A4369
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計(jì)算機(jī))
文件頁(yè)數(shù): 80/115頁(yè)
文件大?。?/td> 710K
代理商: HD40A4369
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HD404369 Series
80
Serial Mode Register (SMR: $005):
This register has the following functions (figure 62).
R0
0
/
SCK
pin function selection
Transmit clock selection
Prescaler division ratio selection
Serial interface initialization
Serial mode register (SMR: $005) is a 4-bit write-only register. It is reset to $0 by MCU reset.
A write signal input to serial mode register (SMR: $005) discontinues the input of the transmit clock to the
serial data register and octal counter, and the octal counter is reset to 000. Therefore, if a write is performed
during data transfer, the serial interrupt request flag (IFS: $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
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 62 Serial Mode Register (SMR)
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