參數(shù)資料
型號(hào)： M37548G2-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封裝： 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, LSSOP-20
文件頁(yè)數(shù)： 18/84頁(yè)
文件大?。?/td> 1427K
代理商： M37548G2-XXXFP
Rev.2.02
Mar 31, 2009
Page 25 of 81
REJ03B0210-0202
7548 Group
Key Input Interrupt (Key-On Wakeup)
A key-on wakeup interrupt request is generated by applying “L”
level to any pin of port P1 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 24, where an interrupt request is generated by
pressing one of the keys provided as an active-low key matrix
which uses ports P10 to P13 as input ports.
Fig 24. Connection example when using key input interrupt and port P1 block diagram
Key input interrupt request
* P-channel transistor for pull-up
** CMOS output buffer
Port P15
latch
**
*
P15 output
**
*
**
*
**
*
**
*
**
*
Port P1
Input read circuit
Port P1 pull-up control register
bit 5 = “0”
Port PXx
“L” level output
Port P15
Direction register = “1”
P14 output
Port P14 key-on wakeup
selection bit
Port P15 key-on wakeup
selection bit
Port P1 pull-up control register
bit 4 = “0”
Port P14
latch
Port P14
Direction register = “1”
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
Falling edge
detection
P13 input
P12 input
P11 input
P10 input
Port P13 key-on wakeup
selection bit
Port P1 pull-up control register
bit 3 = “1”
Port P13
Direction register = “0”
Port P13
latch
Port P12 key-on wakeup
selection bit
Port P1 pull-up control register
bit 2 = “1”
Port P12
Direction register = “0”
Port P12
latch
Port P10 key-on wakeup
selection bit
Port P1 pull-up control register
bit 0 = “1”
Port P10
Direction register = “0”
Port P10
latch
Port P11 key-on wakeup
selection bit
Port P1 pull-up control register
bit 1 = “1”
Port P11
Direction register = “0”
Port P10
latch
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