參數(shù)資料
型號: 38D5
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機(jī)
文件頁數(shù): 32/141頁
文件大?。?/td> 2027K
代理商: 38D5
Rev.3.01
REJ03B0158-0301
Aug 08, 2007
Page 32 of 134
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 P2
0
P2
3
, P4
4
P4
7
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 P4
4
P4
7
.
Fig. 23 Connection example when using key input interrupt
Port P4
4
latch
Port P4 direction
register bit 4 = “0”
Port P4
5
latch
Port P4 direction
register bit 5 = “0”
Port P4
6
latch
Port P4 direction
register bit 6 = “0”
Port P4
7
latch
Port P4 direction
register bit 7 = “0”
Port P2
0
latch
Port P2 direction
register bit 0 = “1”
Port P2
1
latch
Port P2 direction
register bit 1 = “1”
Port P2
2
latch
Port P2
2
direction
register bit 2 = “1”
Port P2
3
latch
Port P2 direction
register bit 3 = “1”
P4
4
input
P4
5
input
P4
6
input
P4
7
input
P2
0
output
P2
1
output
P2
2
output
P2
3
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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