參數(shù)資料
型號: HCD40C4084
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉換器的低壓微計算機)
中文描述: 低電壓如同在微機芯片的A / D轉換器(帶片上的A / D轉換器的低壓微計算機)
文件頁數(shù): 102/162頁
文件大?。?/td> 482K
代理商: HCD40C4084
HD404374/HD404384/HD404389/HD404082/HD404084 Series
102
Bit 1 (SMR21) of serial mode register 2 (SMR2) performs SO pin high/low control in the idle state. The
SO pin changes at the same time as the high/low write.
SMR21
0
1
R2
2
/SI/SO pin output buffer control
PMOS active
PMOS off (NMOS open-drain output)
SMR22
0
1
Idle high/low control
SO pin set to low-level output in idle state
SO pin set to high-level output in idle state
Serial mode register 2 (SMR2: $025)
Bit
Read/Write
Initial value on reset
Bit name
3
2
W
0
SMR22
1
W
undeternined
SMR21
0
Figure 57 Serial Mode Register 2 (SMR2)
Serial data register (SRL: $026, SRU: $027):
The serial data register (SRL, SRU) has the following functions. See figures 58 and 59.
Transmit data write and shift operations
Receive data shift and read operations
The data written to the serial data register (SRL, SRU) is output LSB-first from the SO pin in
synchronization with the falling edge of the serial clock.
External data input LSB-first from the SI pin is latched in synchronization with the rising edge of the serial
clock. Figure 60 shows the serial clock and data input/output timing chart.
Writing and reading of the serial data register (SRL, SRU) must be performed only after data
transmission/reception is completed. The data contents are not guaranteed if a read or write is performed
during data transmission or reception.
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