7480 Datasheet, PDF (42/98 Pages) Bi technologies – 7/8 Diameter 5-Turn Wirewound Precision Potentiometer

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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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.
P41/CNTR1
EG3
P40/CNTR0
EG2
P30/INT0
EG0
P31/INT1
P07
EG1
CPU stop status signal
Pull-up control
register
Direction register
Port P41 data read circuit
CNTR1 interrupt request signal
Port P40 data read circuit
CNTR0 interrupt request signal
Port P30 data read circuit
INT0 interrupt request signal
Port P31 data read circuit
EG5
INT1 interrupt request signal
P01
P00
Pull-up control
register
Direction register
Pull-up control
register
Direction register
Port P0 data read circuit
Fig. 43 Block diagram of interrupt input/key-on wake-up circuit
41