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參數(shù)資料
| 型號： | M38C59MF-XXXHP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PQFP80 |
| 封裝： | 12 X 12 MM, 0.50 MM PITCH, PLASTIC, LQFP-80 |
| 文件頁數(shù)： | 17/75頁 |
| 文件大?。?/td> | 995K |
| 代理商： | M38C59MF-XXXHP |
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Rev.2.00
Nov 23, 2005
page 24 of 73
REJ03B0028-0200
38C5 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 P20–P23, P44–P47 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 20, where an interrupt request is generated by press-
ing one of the keys consisted as an active-low key matrix which in-
puts to ports P44–P47.
Fig. 20 Connection example when using key input interrupt
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”
Port P44
latch
Port P4 direction
register bit 4 = “0”
Port P45
latch
Port P4 direction
register bit 5 = “0”
Port P46
latch
Port P4 direction
register bit 6 = “0”
Port P47
latch
Port P20
latch
Port P21
latch
Port P22
latch
Port P23
latch
Port P2 direction
register bit 3 = “1”
P44 input
P45 input
P46 input
P47 input
P20 output
P21 output
P22 output
P23 output
PULL register 3
Bit 1 = “1”
Port P2
Input reading circuit
Port PXx
“L” level output
Key input interrupt request
Port P4
Input reading circuit
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”
P-channel transistor for pull-up
CMOS output buffer
Port P4 direction
register bit 7 = “0”
Port P2 direction
register bit 2 = “1”
Port P2 direction
register bit 1 = “1”
Port P2 direction
register bit 0 = “1”
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