參數(shù)資料
型號(hào)： M37481E8-XXXSP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-42
文件頁數(shù)： 40/100頁
文件大小： 1457K
代理商： M37481E8-XXXSP
41
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
Recovery From Power-down Status By Key
Input Interrupt
(Key-on wake-up)
“Key-on wake-up” is one way of recovery from a power-down sta-
tus by using the STP or WIT instruction.
If an “L” level voltage is input to any pin of port P0 when bit 5 of
the edge polarity selection register is “1”, an interrupt occurs, and
a recovery can be made to the normal operating state. If a key
matrix of active “L” with port P0 as an input port is constructed, a
recovery can be made to the normal operating status by pressing
a key.
The key input interrupt is in common with the INT1 interrupt. When
bit 5 of the edge polarity selection register is set to “1”, the key in-
put interrupt function is selected. If this bit is set to “1” except in
the power-down status, both INT1 and key-on wake-up are invali-
dated.
Fig. 43 Block diagram of interrupt input/key-on wake-up circuit
P41/CNTR1
P40/CNTR0
P30/INT0
P31/INT1
P07
P01
EG3
Port P41 data read circuit
CNTR1 interrupt request signal
Port P40 data read circuit
EG0
Port P30 data read circuit
INT0 interrupt request signal
Port P31 data read circuit
INT1 interrupt request signal
CPU stop status signal
Port P0 data read circuit
EG1
EG5
P00
EG2
CNTR0 interrupt request signal
Pull-up control
register
Direction register
Pull-up control
register
Direction register
Pull-up control
register
Direction register
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