參數(shù)資料
型號(hào)： UPD17244MC-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(yè)數(shù)： 36/102頁(yè)
文件大?。?/td> 461K
代理商： UPD17244MC-XXX-5A4
36
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
3.7
Port 1B (P1B
0
)
The P1B
0
pin functions alternately as the INT pin. To use the P1B
0
pin, set INTSEL (bit 1 of address 1FH) of the
register file to 0.
The P1B
0
pin functions as a 1-bit CMOS input port.
This port can be used to input a key return signal when a key matrix is used. At this time, whether a 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 P1B
0
, 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 P1B
0
, 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 P1B
0
, the standby mode is released.
If a key matrix is not used, whether a resistor is connected and whether a pull-up or pull-down resistor is connected
can be selected. At this time, the standby mode is not released.
To specify whether a resistor is connected, use P1BPU0 (bit 0 of address 05H) of the register file. To specify
whether a key matrix is used or not, use P1BKEY0 (bit 1 of address 05H) of the register file. To specify a standby
condition (to specify whether a pull-down or pull-up resistor is connected when a key matrix is not used), use P1BHL0
(bit 2 of address 05H) of the register file.
Use the P1B register (address 71H of BANK1) to read the input data.
After reset, the P1B
0
pin is selected and functions as an input port (a key matrix is not used and a resistor is not
connected).
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