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参数资料
型号： M38D59GC-XXXFP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PQFP80
封装： 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件页数： 70/142页
文件大小： 2004K
代理商： M38D59GC-XXXFP
Rev.3.04
May 20, 2008
Page 33 of 134
REJ03B0158-0304
38D5 Group
Key Input Interrupt (Key-on Wake-Up)
A key input interrupt request is generated by detecting the falling
edge from any pin of ports P20
P23, P44P47 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 23, where an interrupt request is
generated by pressing one of the keys consisted as an active-low
key matrix which inputs to ports P44
P47.
Fig. 23 Connection example when using key input interrupt
Port P44
latch
Port P4 direction
register bit 4 = “0”
Port P45
latch
Port P4 direction
register bit 5 = “0”
Port P46
latch
Port P4 direction
register bit 6 = “0”
Port P47
latch
Port P4 direction
register bit 7 = “0”
Port P20
latch
Port P2 direction
register bit 0 = “1”
Port P21
latch
Port P2 direction
register bit 1 = “1”
Port P22
latch
Port P22 direction
register bit 2 = “1”
Port P23
latch
Port P2 direction
register bit 3 = “1”
P44 input
P45 input
P46 input
P47 input
P20 output
P21 output
P22 output
P23 output
PULL register 3
Bit 1 = “1”
Port P2
Input reading circuit
Key input interrupt request
Port PXx
“L” level output
P-channel transistor for pull-up
CMOS output buffer
Port P4
Input reading circuit
Key input control
register bit 0 = “1”
Key input control
register bit 1 = “1”
Key input control
register bit 2 = “1”
Key input control
register bit 3 = “1”
Key input control
register bit 4 = “1”
Key input control
register bit 5 = “1”
Key input control
register bit 6 = “1”
Key input control
register bit 7 = “1”
Segment output
disable register 1
Bit 3 = “1”
Segment output
disable register 1
Bit 2 = “1”
Segment output
disable register 1
Bit 1 = “1”
Segment output
disable register 1
Bit 0 = “1”
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