參數(shù)資料
型號: HD40A4639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 95/133頁
文件大?。?/td> 803K
代理商: HD40A4639R
HD404639R Series
95
Bit
Initial value
Read/Write
Bit name
3
0
W
SM2A3
2
0
W
SM2A2
0
0
W
SM2A0
1
0
W
SM2A1
Serial mode register 2A (SM2A: $01B)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SM2A2
SM
SM2A1
SM2A3
0
1
R5
1
/
SCK
2
mode selection
R5
1
SCK
2
SCK
2
Output
Output
Input
Clock source
Prescaler
System clock
External clock
division ratio
Figure 77 Serial Mode Register 2A (SM2A)
Serial Mode Register 2B (SM2B: $01C):
This register has the following functions (figure 78).
Serial interface 2 prescaler division ratio selection
Serial interface 2 output level control in idle states
R5
3
/SO
2
pin PMOS control
Serial mode register 2B is a 3-bit write-only register. It cannot be written during serial interface 2 data
transfer. Bit 0 (SM2B0) and bit 2 (SM2B2) are reset to $0 by MCU reset.
By setting bit 0 (SM2B0) of this register, the serial interface 2 prescaler division ratio of serial interface 2 is
selected. By resetting bit 1 (SM2B1), the output level of the SO
2
pin is controlled in idle states of serial
interface 2. The output level changes at the same time that SM2B1 is written to.
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