參數(shù)資料
型號： 6P8A
廠商： NEC Corp.
英文描述： MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
中文描述： 馬鞍山集成電路4位單片機(jī)的紅外遙控傳輸
文件頁數(shù)： 20/95頁
文件大?。?/td> 692K
代理商： 6P8A
20
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
4.1 K
I/O
Port (P0)
The K
I/O
port is an 8-bit I/O port for key scan output.
I/O mode is set by bit 1 of the P4 register.
If a read instruction is executed, the pin state can be read in input mode, whereas the output latch contents can
be read in output mode.
If a write instruction is executed, data can be written to the output latch regardless of input or output mode.
After reset, the port is placed in output mode and the value of the output latch (P0) becomes 1111 1111B.
The K
I/O
port incorporates a pull-down resistor, allowing pull-down in input mode only.
Caution When a key is double-pressed, a high-level output and a low-level output may conflict at the
K
I/O
port. To avoid this, the low-level output current of the K
I/O
port is held low. Therefore, be
careful when using the K
I/O
port for purposes other than key scan output.
The K
I/O
port is designed so that even when connected directly to V
DD
within the normal supply
voltage range (V
DD
= 1.9 to 3.6 V), no problem occurs.
Table 4-2. K
I/O
Port (P0)
Bit
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
Name
K
I/O7
K
I/O6
K
I/O5
K
I/O4
K
I/O3
K
I/O2
K
I/O1
K
I/O0
b
0
to b
7
: When reading:
In input mode, the K
I/O
pin’s state is read.
In output mode, the K
I/O
pin’s output latch contents are read.
Data is written to the K
I/O
pin’s output latch regardless of input or output mode.
When writing:
4.2 K
I
Port/Special Ports (P1)
4.2.1 K
I
port (P
11
: bits 4 to 7 of P1)
The K
I
port is a 4-bit input port for key input. The pin state can be read.
The use of a pull-down resistor for the K
I
port can be specified in 4-bit units by software using bit 5 of the P4
register. After reset, a pull-down resistor is connected.
Table 4-3. K
I
/Special Port Register (P1)
Bit
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
Name
K
I3
K
I2
K
I1
K
I0
S
1
/LED
S
0
S
2
Fixed to “1”
b
1
:
b
2
:
The state of the S
2
pin is read (read only).
In input mode, state of the S
0
pin is read (read only).
In OFF mode, this bit is fixed to 1.
The state of the S
1
/LED pin is read regardless of input/output mode (read only).
b
4
to b
7
: The state of the K
I
pin is read (read only).
b
3
:
Caution In order to prevent malfunction, be sure to input a low level to one or more of pins K
I0
to K
I3
when POC is released by supply voltage rising (Can be left open. When open, leave the pull-
down resistor connected).
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