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參數(shù)資料
| 型號： | UPD17246MC-xxx-5A4 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質 |
| 文件頁數(shù)： | 10/102頁 |
| 文件大?。?/td> | 461K |
| 代理商： | UPD17246MC-XXX-5A4 |
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10
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
1.1
Pin Function List (2/3)
Pin No.
Pin Name
Function
Output Format
After Reset
4
5
6
7
P0E
0
P0E
1
P0E
2
P0E
3
These pins constitute a 4-bit I/O port that can be set to the input or
output mode in 1-bit units.
If this port is set to the input mode when a key matrix is used, it
functions as a CMOS input port with a pull-up resistor and can be
used to input key return signals. If one of the pins of this port
goes low, the standby mode is released.
If this port is set to the output mode when a key matrix is used, it
functions as an N-ch open-drain output port and can be used to
output key matrix signals.
If this port is set to the input mode when a key matrix is not used,
it functions as a CMOS input port to/from which a resistor can be
connected/disconnected in 1-bit units. If this port is set in the
output mode when a key matrix is not used, it functions as a high-
current CMOS output port.
When key
matrix is
used: N-ch
open-drain,
when key
matrix is not
used: CMOS
push-pull
CMOS input
(when key
matrix is not
used and no
resistor
connected)
8
REM
Outputs transfer signal for infrared remote controller.
Active-high output.
CMOS
push-pull
Low-level
output
9
V
DD
Power supply
–
–
10
11
X
OUT
X
IN
Connects ceramic resonator for system clock oscillation.
A capacitor (15 pF) for oscillation can be connected by using a
mask option.
–
(Oscillation
stops)
12
GND
Ground
–
–
13
RESET
System reset input. Turns ON pull down resistor if the POC or
watchdog timer overflows and if the stack pointer overflows or
underflows, and resets the system. Usually, the pull-down resistor
is ON.
–
Input
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