參數(shù)資料
型號(hào)： M37640E8FS
廠(chǎng)商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述： 單芯片8位CMOS微機(jī)
文件頁(yè)數(shù)： 29/96頁(yè)
文件大?。?/td> 1477K
代理商： M37640E8FS
29
Ver 1.4
MITSUBISHI MICROCOMPUTERS
7640 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
1.16 KEY-ON WAKE UP
This device contains a key-on wake up interrupt func-
tion. The key-on wake up interrupt function is one way
of returning from a power-down state caused by the
STP or WIT instructions. This interrupt is generated
by applying low level to any pin of Port P2. If a key
matrix is connected as shown in Figure 1.31, the mi-
crocomputer can be returned to a normal state by
pressing any one of the keys. Key-on wake up is en-
abled in single-chip mode only.
Fig. 1.31. Port P2 with Key-on Wake up function
Key-on
wake up
Interrupt
Request
P
Port PXx
L level output from arbitrary port Xx
P2
7
output
P2
6
output
P2
5
output
P2
4
output
P2
3
input
P2
2
input
P2
1
input
P2
0
input
Off Chip
On Chip
Pull P2 register
bit 0
Port P20
latch
Port P2
direction register
bit 0 = "0"
Port P2
direction register
bit 1 = "0"
Port P2
direction register
bit 2 = "0"
Port P2
register
bit 7 = 1
Port P2
direction register
bit 6 = 1
Port P2
direction register
bit 5 = 1
Port P2
direction register
bit 4 = 1
Port P2
direction register
bit 3 = "0"
Port P21
latch
Port P22
latch
Port P23
latch
Port P24
latch
Port P25
latch
Port P26
latch
Port P27
latch
Pull P2 register
bit 1
Pull P2 register
bit 2
Pull P2 register
bit 3
Pull P2 register
bit 4
Pull P2 register
bit 5
Pull P2 register
bit 7
Pull P2 register
bit 6
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