UPD65 NEC [NEC], UPD65 Datasheet - Page 18

• Manufacturer Part Number: UPD65
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [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, the register becomes 0010 0110B.
Remark In OUTPUT mode or in OFF mode, all the pull-down resistors are automatically disconnected.
b
b
b
b
b
b
0
1
2
3
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
: Specified the use of the STOP mode release by S
: Specifies the availability of the pull-down resistor in S
: Specifies the availability of the pull-down resistor in K
“0” = IN (INPUT mode); “1” = OUT (OUTPUT mode).
down unavailable); “1” = enable (pull-down available).
“1” = ON (available).
“1” = ON (available)
Bit
Name
Set
value
When reset
0
1
b
Fixed
to “0”
0
7
—
Table 3-6. Control Register 1 (P4)
b
Fixed
to “0”
0
6
I/O
1
—
/LED port. “0” = S
0
port.
port. “0” = OFF mode (high impedance); “1” = IN (INPUT mode).
Data Sheet U14380EJ2V0DS00
Pull-down Pull-down
b
K
OFF
ON
1
5
I
b
S
OFF
ON
0
2
4
0
port (with/without pull-down resistor). “0” = disable (pull-
/S
1
1
(INPUT mode); “1” = LED (output mode).
0
I
/S
port. “0” = OFF (unavailable);
STOP release
b
Disable S
Enable
0
1
3
S
port INPUT mode. “0” = OFF (unavailable);
2
b
S
mode
LED
1
2
1
1
/LED
b
K
mode
IN
OUT
1
1
I/O
b
S
mode
OFF
IN
0
0
0
PD64A, 65