參數(shù)資料
型號(hào): HD4074459
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))
文件頁數(shù): 53/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
53
Pins R4
1
–R4
3
are multiplexed with peripheral pins
SCK
, SI, and SO, respectively. The peripheral function
modes of these pins are selected by bit 3 (SMRA3) of serial mode register A (SMRA: $005), and bits 0 and
1 (PMRA0, PMRA1) port mode register A (PMRA: $004) (figures 36 and 37).
PMRA0
0
1
R4
3
/SO mode selection
R4
3
SO
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
W
PMRA0
1
0
W
PMRA1
Port mode register A (PMRA: $004)
PMRA1
0
1
R4
2
/SI mode selection
R4
2
SI
Figure 36 Port Mode Register A (PMRA)
Bit
Initial value
Read/Write
Bit name
3
0
W
SMRA3
2
0
W
SMRA2
0
0
W
SMRA0
1
0
W
SMRA1
Serial mode register A (SMRA: $005)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Output
Output
Output
Output
Output
Output
Output
Input
Prescaler
Prescaler
Prescaler
Prescaler
Prescaler
Prescaler
System clock
External clock
÷
2048
÷
512
÷
128
÷
32
÷
8
÷
2
Prescaler
r
SMRA2
SM
SMRA1
SMRA3
0
1
R4
1
/
SCK
mode selection
SCK
R4
1
port
SCK
Figure 37 Serial Mode Register A (SMRA)
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