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7545 Datasheet(PDF) 25 Page - Renesas Technology Corp

Part # 7545
Description  SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PDF  62 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7545 Datasheet(HTML) 25 Page - Renesas Technology Corp

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Rev.1.06
Mar 07, 2008
Page 25 of 59
REJ03B0140-0106
7545 Group
Key Input Interrupt (Key-on Wake-Up)
A key-on wake-up interrupt request is generated by applying the
level set by KEYEDGE to any pin of port P0 that has been set to
input mode and KEYSEL has been valid. In other words, it is
generated when the AND of input level goes from “1” to “0” or
from “0” to “1”.
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 7 = “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 6 = "0”
Port P06
latch
Port P06
Direction register = "1”
**
*
P06 output
PULL register
bit 5 = "0”
Port P05
latch
Port P05
Direction register = "1”
**
*
P05 output
PULL register
bit 4 = "0”
Port P04
latch
Port P04
Direction register = "1”
**
*
P04 output
PULL register
bit 3 = "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 register
Bit 0
Port P01 key-on wakeup
selection register
Bit 1
Port P02 key-on wakeup
selection register
Bit 2
Port P03 key-on wakeup
selection register
Bit 3
Port P04 key-on wakeup
selection register
Bit 4
Port P05 key-on wakeup
selection register
Bit 5
Port P06 key-on wakeup
selection register
Bit 6
Port P07 key-on wakeup
selection register
Bit 7



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