UPD62A NEC, UPD62A Datasheet - Page 18

• Manufacturer Part Number: UPD62A
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC

3.4 Control Register 1 (P4)
18
Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.
When reset, this register becomes 0010 0110B.
b
b
b
b
b
Remark In output mode or in OFF mode, all the pull-down resistors are automatically disconnected.
0
1
2
4
5
: Specifies the input mode of the S
: Specifies the I/O mode of the K
: Specifies the I/O mode of the S
: Specifies the connection of a pull-down resistor in S
: Specifies the connections of a pull-down resistor in K
“0” = IN (input mode); “1” = OUT (output mode).
“1” = ON (connected)
“1” = ON (connected).
Bit
Name
Set
value
After reset
0
1
b
Fixed
to 0
0
7
—
Table 3-6. Control Register 1 (P4)
b
Fixed
to 0
0
I/O
1
/LED port. “0” = S
6
—
0
port.
port. “0” = OFF mode (high impedance); “1” = IN (input mode).
Data Sheet U14474EJ1V0DS00
Pull-down Pull-down
b
K
OFF
ON
1
5
I
b
S
OFF
ON
0
4
0
/S
1
0
1
(input mode); “1” = LED (output mode).
/S
I
port. “0” = OFF (not connected);
1
port input mode. “0” = OFF (not connected);
b
Fixed
to “0”
0
3
—
b
S
mode
S
LED
1
2
1
1
/LED
b
K
mode
IN
OUT
1
1
I/O
b
S
mode
OFF
IN
0
0
0
PD62A