参数资料
型号: M37640E8FP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数: 22/96页
文件大小: 1477K
代理商: M37640E8FP
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
Port
P2
input
read
circuit
Port PXx
L level output from arbitrary port Xx
P27 output
P26 output
P25 output
P24 output
P23 input
P22 input
P21 input
P20 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
direction
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
register
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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