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參數(shù)資料
| 型號(hào)： | UPD17228MC |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 26/84頁(yè) |
| 文件大小： | 393K |
| 代理商： | UPD17228MC |
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μ
PD17225, 17226, 17227, 17228
26
Data Sheet U12643EJ2V0DS00
3.6
INT Pin
This pin inputs an external interrupt request signal. At either the rising or falling edge of the signal input to this pin, the
IRQ flag (RF: address 3EH, bit 0) is set.
The status of this pin can be read by using the INT flag (RF: address 0FH, bit 0). When the high level is input to the
pin, the INT flag is set to “1”; when the low level is input, the flag is reset to “0” (refer to
7.2.1 INT
).
Figure 3-1. Relations between Port Register and Each Pin
Bank Address
Bit
Port
Output Form
70H
Port 0A
Input only
0
71H
Port 0B
72H
Port 0C
N-ch
open-drain
(Output only)
73H
Port 0D
b
3
b
2
b
1
b
0
P0A
3
P0A
2
P0A
1
P0A
0
b
3
b
2
b
1
b
0
P0B
3
P0B
2
P0B
1
P0B
0
b
3
b
2
b
1
b
0
P0C
3
P0C
2
P0C
1
P0C
0
b
3
b
2
b
1
b
0
P0D
3
P0D
2
P0D
1
P0D
0
6FH
Port 0E
COMS
push-pull
b
3
b
2
b
1
b
0
P0E
3
P0E
2
P0E
1
P0E
0
Contents to Be Read
Input Mode
Output Mode
Pin status
Pin status
Output
latch
On Reset
Input mode
(w/pull-up resistor)
Output mode
(Low level output)
Input mode
(w/pull-up resistor)
Contents to Be Written
Input Mode
Output Mode
Output
latch
Output
latch
–
–
–
–
–
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