參數資料
型號: HD4074449
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: 94/123頁
文件大?。?/td> 726K
代理商: HD4074449
HD404449 Series
94
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.
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
Refer to
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 (SM2B: $01C) is a 3-bit write-only register. It cannot be written during serial
interface 2 data transfer. Bit 0 (SM2B0) and bit 2 (SM2B2) is 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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參數描述
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