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)： 35/102頁(yè)
文件大?。?/td> 461K
代理商： UPD17244MC-XXX-5A4
35
Data Sheet U15002EJ1V0DS
μ
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
3.5
Port 0E (P0E
0
to P0E
3
)
This is a 4-bit I/O port. The input mode or output mode and whether a key matrix is used or not can be set for this
port in 1-bit units.
The input and output modes of this port are selected by using P0EBIO (address 27H) of the register file.
Whether a key matrix is used or not is specified by P0EKEY (address 16H) of the register file.
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 pull-up resistor can be connected/disconnected in 1-bit units, by using P0EBPU (address 17H) of the register file
(if a pull-up resistor is connected, it is not disconnected even if the output mode is set). At this time, the standby mode
is not released.
If this port is set to the output mode when a key matrix is not used, it functions as a high-current CMOS output port.
To read the input data from this port or set output data to it, use the P0E register (address 6FH of BANK0). When
this port is read in the output mode, the contents of the output latch are read.
After reset, this port is set to the input mode (a key matrix is not used and a resistor is not connected).
3.6
Port 1A (P1A
0
to P1A
2
)
These pins constitute a 3-bit I/O port that can be set in 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 resistor is connected to this port and the standby mode release
condition (whether it is released when this port 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 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 not used, it functions as a CMOS input port. Connection
of a resistor to this port and whether a pull-up or pull-down resistor is connected to the port can be selected in 1-bit
units. At this time, the standby mode is not released.
If this port is set to the output mode when a key matrix is not used, it functions as a high-current CMOS output port.
To set this port to the input mode or output mode, use P1ABIO (address 25H) of the register file. To specify whether
a key matrix is used or not, use P1AKEY (address 06H) of the register file. To specify whether a resistor is connected,
use P1ABPU (address 07H) of the register file. To specify the standby mode release condition (to specify whether
a pull-down or pull-up resistor is connected when a key matrix is not used), use P1AHL (address 05H) of the register
file.
Use the P1A register (address 70H of BANK1) to read the input data from this port or set output data to it. When
this port is read in the output mode, the contents of the output latch are read.
After reset, this port is set to the input mode (a key matrix is not used and a resistor is not connected).
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