參數(shù)資料
型號: HD404639R
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): 94/133頁
文件大?。?/td> 803K
代理商: HD404639R
HD404639R Series
94
1
1
0
1
7.8125 ms
31.25 ms
Not used
MIS2
0
1
R4
3
/SO
1
PMOS on/off selection
On
Off
Bit
Initial value
Read/Write
Bit name
3
0
W
MIS3
2
0
W
MIS2
0
0
W
MIS0
1
0
W
MIS1
Miscellaneous register (MIS: $00C)
MIS1
0
MIS0
0
t
RC
0.12207 ms
0.24414 ms
*
MIS3
0
1
Pull-up MOS on/off selection
Off
On
Note:
*
This value is valid only for direct transfer operation.
Figure 76 Miscellaneous Register (MIS)
Serial Mode Register 2A (SM2A: $01B):
This register has the following functions (figure 77).
R5
1
/
SCK
2
pin function selection
Serial interface 2 transmit clock selection
Serial interface 2 prescaler division ratio selection
Serial interface 2 initialization
Serial mode register 2A (SM2A: $01B) is a 4-bit write-only register. It is reset to $0 by MCU reset.
A write signal input to serial mode register 2A discontinues the input of the transmit clock to serial data
register 2 (SR2L: $01D, SR2U: $01E) and the octal counter, and the octal counter is reset to 000.
Therefore, if a write is performed during data transfer, the serial 2 interrupt request flag (IFS2: $023, bit 2)
is set.
Written data is valid from the second instruction execution cycle after the write operation, so the SM2A
read instruction must be executed at least two cycles after that.
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