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参数资料
| 型号： | M37481E8SP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-42 |
| 文件页数： | 39/100页 |
| 文件大小： | 1457K |
| 代理商： | M37481E8SP |
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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
40
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
STP/WIT Instruction Control
The STP instruction and the WIT instruction can be enabled or
disabled selectively by using the STP instruction operation control
register. To cope with a program runaway after reset, the STP in-
struction and the WIT instruction are disabled in the initial status.
The STP and WIT instructions can be set as enable/disable only
by writing to the STP instruction operation control register twice
successively so as not to stop the oscillation clock even if a write
data error is caused by program runaway. Figure 41 shows a
structure of the STP instruction operation control register.
Fig. 41 Structure of STP instruction operation control register
Explanation of STP Instruction Operation
Control Register
The STP instruction operation control register will be enabled by
writing data to the same address twice successively. If data is not
written in continuous form, the written data is not valid but the pre-
vious value is held.
If an interrupt is received while the same data is written twice,
there is a possibility that the write instruction in the interrupt rou-
tine may be executed. For this reason, rewriting is required after
interrupt disable. Figure 42 shows a reference example of data re-
writing.
Fig. 42 Reference example of data rewriting
b7
b0
STP instruction operation control register
(STPCON: address 00DE 16)
STP instruction and WIT instruction enable/disable selection bit (Note)
0 : STP/WIT instruction enabled
1 : STP/WIT instruction disabled
Not used (“0” at read)
The STP instruction and the WIT instruction are disabled in the initial status. When using these
instructions, set bit 0 of the STP instruction operation control register to “1”, then set this bit to “0”.
(Writing twice successively)
When not using the STP and WIT instructions, set this bit to “1” either once or twice.
Note :
qSTP/WIT instruction enable
SEI
LDM #01H, 0DEH
LDM #00H, 0DEH
CLI
Use only in interrupt enable status
Interrupt
disable in
this period
qSTP/WIT instruction disable
SEI
LDM #01H, 0DEH
CLI
Use only in interrupt enable status
Interrupt
disable in
this period
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37481E8SS | 制造商:Renesas Electronics Corporation 功能描述:MCU 8BIT 740 CISC 16KB EPROM 5V 42PIN SDIP - Bulk |
| M37481E8T | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481E8T-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
| M37481E8T-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37481E8-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES |
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