參數(shù)資料
型號(hào)： UPD17243MC-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(zhì)
文件頁數(shù)： 9/102頁
文件大?。?/td> 461K
代理商： UPD17243MC-XXX-5A4
9
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
1.
PIN FUNCTIONS
1.1
Pin Function List (1/3)
Pin No.
Pin Name
Function
Output Format
After Reset
28
29
1
2
P0D
0
P0D
1
P0D
2
P0D
3
These pins constitute a 4-bit I/O port which can be set to the input
or output mode in 4-bit units (group I/O).
In the input mode, these pins serve as 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 must be released when at least
one of the input lines goes low. In the output mode, these pins are
used as N-ch open-drain output pins and can be used to output
the signals of a key matrix.
N-ch
open drain
Low-level
output
3
P1B
0
/INT
This is an input port pin. Whether this pin functions as the P1B
0
pin or the INT pin can be selected by the register file.
P1B
0
This is a 1-bit CMOS input port.
This port can be used to input key return signals when a key
matrix is used. 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.
1. If connection of a resistor is specified and if it is specified that
the standby mode is released when this pin goes low
... A pull-up resistor is connected. If a low level is input to the
P1B
0
pin, 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 pin goes high
... A pull-down resistor is connected. If a high level is input to
the P1B
0
pin, 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 pin goes low
(or high)
... No resistor is connected. If a low (or high) level is input to
the P1B
0
pin, the standby mode is released.
If a key matrix is not used, whether a resistor is connected and
whether the resistor is pull-up or pull-down can be
selected.
INT
This is an external interrupt request signal. It can also be used
to release the standby mode if an external interrupt request
signal is input to this pin while the INT pin interrupt enable flag
(IP) is set.
–
P1B
0
input
(when key
matrix not
used and no
resistor
connected)
相關(guān)PDF資料
PDF描述
UPD17244MC-xxx-5A4 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS
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