參數(shù)資料
型號(hào)： M37471M2-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP56
封裝： 10 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-56
文件頁(yè)數(shù)： 18/49頁(yè)
文件大?。?/td> 601K
代理商： M37471M2-XXXFP
22
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
KEY ON WAKE UP
“Key on wake up” is one way of returning from a power down state
caused by the STP or WIT instruction. If any terminal of port P0
has “L” level applied, after bit 5 of the edge polarity selection regis-
ter (EG5) is set to “1”, an interrupt is generated and the
microcomputer is returned to the normal operating state. A key
matrix can be connected to port P0 and the microcomputer can be
returned to a normal state by pushing any key.
The key on wake up interrupt is common with the INT1 interrupt.
When EG5 is set to “1”, the key on wake up function is selected.
However, key on wake up cannot be used in the normal operating
state. When the microcomputer is in the normal operating state,
both key on wake up and INT1 are invalid.
Fig. 13 Block diagram of interrupt input and key on wake up circuit
P33/CNTR1
P32/CNTR0
P30/INT0
P31/INT1
P07
P01
EG3
Port P33 data read circuit
CNTR interrupt request signal
Port P32 data read circuit
EG0
Port P30 data read circuit
INT0 interrupt request signal
Port P31 data read circuit
INT1 interrupt request signal
CPU halt state signal
Port P0 data read circuit
EG1
EG5
P00
Pull-up control
register
Direction register
Pull-up control
register
Direction register
Pull-up control
register
Direction register
EG2
Noise
eliminating
circuit
1/2
XCIN
(P50)
XIN
CM7
EG4
Noise
eliminating
circuit
(
Select gate: At reset, shaded side is connected.)
Note : The 7470 group does not have XCIN input.
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