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參數(shù)資料
| 型號： | M38C89EFFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 0.50 MM PITCH, PLASTIC, LQFP-144 |
| 文件頁數(shù)： | 13/55頁 |
| 文件大小： | 981K |
| 代理商： | M38C89EFFP |
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19
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
Key Input Interrupt (Key-on Wake-Up)
A key input interrupt request is generated by applying “L” level to any
pin of port P2 that have been set to input mode. In other words, it is
generated when AND of input level goes from “1” to “0”. An example
of using a key input interrupt is shown in Figure 15, where an inter-
rupt request is generated by pressing one of the keys consisted as
an active-low key matrix which inputs to ports P20–P23.
Fig. 15 Connection example when using key input interrupt and port P2 block diagram
Port P20
latch
Port P21
latch
Port P22
latch
Port P23
latch
Port P24
latch
Port P25
latch
Port P26
latch
Port P27
latch
P20 input
P21 input
P22 input
P23 input
P24 output
P25 output
P26 output
P27 output
PULL register A
Bit 5 = “1”
Port P2
Input reading circuit
Port PXx
“L” level output
P-channel transistor for pull-up
CMOS output buffer
Key input interrupt request
Port P27 direction
register = “1”
Port P26 direction
register = “1”
Port P25 direction
register = “1”
Port P24 direction
register = “1”
Port P23 direction
register = “0”
Port P22 direction
register = “0”
Port P21 direction
register = “0”
Port P20 direction
register = “0”
PULL register A
Bit 4 = “1”
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