參數(shù)資料
型號(hào)： UPD1724x
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(zhì)
文件頁數(shù)： 11/102頁
文件大?。?/td> 461K
代理商： UPD1724X
11
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
1.1
Pin Function List (3/3)
Pin No.
Pin Name
Function
Output Format
After Reset
14
15
30
P1A
0
P1A
1
P1A
2
These pins constitute a 3-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 and can be used to input key
return signals. At this time, whether a pull-up/down resistor is
connected to this port and the standby mode release condition
(whether it is released when this pin is high or low) can be
selected in 1-bit units
1. If connection of a resistor is specified and if it is specified that
the standby mode is released when this port goes low
... A pull-up resistor is connected. If a low level is input to
the set key, the standby mode is released.
2. If connection of a resistor is specified and if it is specified that
the standby mode is released when this port goes high
... A pull-down resistor is connected. If a high level is input
to the set key, the standby mode is released.
3. If connection of a resistor is not specified and if it is specified
that the standby mode is released when this port goes low
(or high)
... No resistor is connected. If a low (or high) level is input to
the set key, 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 used, it
functions as a CMOS input port.
Connection of a resistor to this port and whether the resistor is
pull-up or pull-down can be selected 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)
16
17
18
19
P0A
0
P0A
1
P0A
2
P0A
3
These pins are CMOS input pins with a 4-bit pull-up resistor.
They can be used to input the key return signals of a key matrix.
If any one of these pins goes low, the standby status is released.
–
CMOS input
with pull-up
resistor
20
21
22
23
P0B
0
P0B
1
P0B
2
P0B
3
These pins constitute a 4-bit I/O port that can be set to the input or
output mode in 1-bit units.
In the input mode, these pins are CMOS input pins with a pull-up
resistor, and can be used to input the key return signals of a key
matrix. The standby status is released when at least one of these
pins goes low.
In the output mode, they serve as N-ch open-drain output pins and
can be used to output the key return signals of a key matrix.
N-ch
open drain
CMOS input
with pull-up
resistor
24
25
26
27
P0C
0
P0C
1
P0C
2
P0C
3
These pins constitute a 4-bit I/O port that can be set to the input or
output mode in 4-bit units (group I/O).
In the input mode, these pins are CMOS input pins with a pull-up
resistor, and can be used to input the key return signals of a key
matrix. The standby status is released when at least one of these
pins goes low.
In the output mode, they serve as N-ch open-drain output pins and
can be used to output the key return signals of a key matrix.
N-ch
open drain
Low-level
output
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