參數(shù)資料
型號: HD4074459
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): 91/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
91
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
SMRB0
1
Undefined
W
SMRB1
SMRB0
0
1
Serial clock division ratio
Prescaler output divided by 2
Prescaler output divided by 4
Serial mode register B (SMRB: $028)
SMRB1
0
1
Output level control in idle states
Low level
High level
Figure 72 Serial Mode Register B (SMRB)
Serial Data Register (SRL: $006, SRU: $007):
This register has the following functions (figures 73 and
74).
Transmission data write and shift
Receive data shift and read
Writing data in this register is output from the SO pin, LSB first, synchronously with the falling edge of the
transmit clock (figure 75); data is input, LSB first, through the SI pin at the rising edge of the transmit
clock.
Data cannot be read or written during serial data transfer. If a read/write occurs during transfer, the
accuracy of the resultant data cannot be guaranteed.
Bit
Initial value
Read/Write
Bit name
3
Undefined
R/W
SR3
2
Undefined
R/W
SR2
0
Undefined
R/W
SR0
1
Undefined
R/W
SR1
Serial data register (lower digit) (SRL: $006)
Figure 73 Serial Data Register Lower Digit (SRL)
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