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| 型號： | UPD17240MC-XXX-5A4-A |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO30 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-30 |
| 文件頁數(shù)： | 33/102頁 |
| 文件大?。?/td> | 668K |
| 代理商： | UPD17240MC-XXX-5A4-A |
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36
Data Sheet U15002EJ1V0DS
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
3.7
Port 1B (P1B0)
The P1B0 pin functions alternately as the INT pin. To use the P1B0 pin, set INTSEL (bit 1 of address 1FH) of the
register file to 0.
The P1B0 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 P1B0, 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 P1B0, 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 P1B0, 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 P1B0 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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| UPD17242 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
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