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M37544G2GP Datasheet(PDF) 21 Page - Renesas Technology Corp

Part # M37544G2GP
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  68 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M37544G2GP Datasheet(HTML) 21 Page - Renesas Technology Corp

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7544 Group
Rev.1.04
2004.06.08
page 21 of 66
REJ03B0012-0104Z
Key Input Interrupt (Key-On Wake-Up)
A key-on wake-up interrupt request is generated by applying “L”
level to any pin of port P0 that has been set to input mode.
In other words, it is generated when the 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 provided as an active-low key matrix which uses
ports P00 to P03 as input ports.
Fig. 21 Connection example when using key input interrupt and port P0 block diagram
Port PXx
“L” level output
PULL register
bit 3 = “0”
Port P07
latch
Port P07
Direction register = “1”
**
*
P07 output
Key input interrupt request
Port P0
Input read circuit
* P-channel transistor for pull-up
** CMOS output buffer
PULL register
bit 3 = “0”
Port P06
latch
Port P06
Direction register = “1”
**
*
P06 output
PULL register
bit 3 = “0”
Port P05
latch
Port P05
Direction register = “1”
**
*
P05 output
PULL register
bit 3 = “0”
Port P04
latch
Port P04
Direction register = “1”
**
*
P04 output
PULL register
bit 2 = “1”
Port P03
latch
Port P03
Direction register = “0”
**
*
P03 input
PULL register
bit 2 = “1”
Port P02
latch
Port P02
Direction register = “0”
**
*
P02 input
PULL register
bit 1 = “1”
Port P01
latch
Port P01
Direction register = “0”
**
*
P01 input
PULL register
bit 0 = “1”
Port P00
latch
Port P00
Direction register = “0”
**
*
P00 input
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Port P00 key-on wakeup
selection bit



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