參數(shù)資料
型號: UPD17235MC
廠商: NEC Corp.
元件分類: 4位微控制器
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述: 4位單片機(jī)的小型通用紅外遙控器
文件頁數(shù): 30/92頁
文件大小: 378K
代理商: UPD17235MC
Data Sheet U14360EJ1V0DS00
μ
PD17230, 17231, 17232, 17233, 17234, 17235, 17236
30
3.5
Port 0E (P0E
0
through P0E
3
)
This is a 4-bit I/O port which can be set in the input or output mode in 1-bit units by the P0EBIO (address 27H)
of the register file.
To read the input data or to set the output data, use the P0E register (address 6FH of BANK0). When data is read
in the output mode, the contents of the output latch are read.
Connection of a pull-up resistor can be specified in 1-bit units by the P0EBPU (address 17H) of the register file.
(When the pull-up resistor is connected, note that the pull-up resistor is not disconnected even when the output mode
is set.)
On reset, this port is set in the input port.
3.6
Port 1A (P1A
0
)
This port can be set in the input or output mode by mask option.
In the input mode, this port serves as a CMOS input port. The input data is read by using port register P1A (address
70H of BANK1). This port cannot be used to release the STOP mode.
In the output mode, it serves as an N-ch open-drain output port and can be used as a key source line of a key matrix.
The output data is set by using port register P1A (address 70H of BANK1). When this port is read in the output mode,
the contents of the output latch are read.
On reset, this port goes into a high-impedance state.
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