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38D2 Datasheet(PDF) 29 Page - Renesas Technology Corp

Part # 38D2
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  136 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

38D2 Datasheet(HTML) 29 Page - Renesas Technology Corp

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Rev.3.02
Apr 10, 2008
Page 29 of 131
REJ03B0177-0302
38D2 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 P00
−P03, P54−P57 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 21, where an interrupt request is
generated by pressing one of the keys consisted as an active-low
key matrix which inputs to ports P54
−P57.
Fig. 21 Connection example when using key input interrupt
∗
∗
∗
∗
∗
∗
∗
∗
∗∗
∗∗
∗∗
∗∗
∗∗
∗∗
∗∗
∗∗
Port P54
latch
Port P54
direction register = “0”
Port P55
latch
Port P55
direction register = “0”
Port P56
latch
Port P56
direction register = “0”
Port P57
latch
Port P57
direction register = “0”
Port P00
latch
Port P00
direction register = “1”
Port P01
latch
Port P01
direction register = “1”
Port P02
latch
Port P02
direction register = “1”
Port P03
latch
Port P03
direction register = “1”
P54 input
P55 input
P56 input
P57 input
P00 output
P01 output
P02 output
P03 output
PULL register
Bit 5 = “1”
Port P0
Input reading circuit
Key input interrupt request
Port PXx
“L” level output
∗ P-channel transistor for pull-up
∗∗ CMOS output buffer
Port P5 Input
reading circuit
Key input control
register = “1”
Key input control
register = “1”
Key input control
register = “1”
Key input control
register = “1”
Key input control
register = “1”
Key input control
register = “1”
Key input control
register = “1”
Key input control
register = “1”
Segment output
disable register 0
Bit 3 = “1”
Segment output
disable register 0
Bit 2 = “1”
Segment output
disable register 0
Bit 1 = “1”
Segment output
disable register 0
Bit 0 = “1”



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