upd64a Renesas Electronics Corporation., upd64a Datasheet - Page 18

• Manufacturer Part Number: upd64a
• Description: 4-bit Single-chip Microcontroller For Infrared Remote Control Transmission
• Manufacturer: Renesas Electronics Corporation.

3.4 Control Register 1 (P4)
18
Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.
After 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
: Specifies the use of the STOP mode release for the S
: Specifies the availability of the pull-down resistor for the S
: Specifies the availability of the pull-down resistor for the K
(pull-down unavailable); “1” = Enabled (pull-down available).
“1” = ON (available).
“1” = ON (available).
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. “0” = IN (input mode); “1” = OUT (output mode).
port. “0” = OFF mode (high impedance); “1” = IN (input mode).
Data Sheet U14380EJ3V0DS00
Pull-down Pull-down
b
K
OFF
ON
1
5
I
b
S
OFF
ON
0
4
0
/S
1
2
1
(input mode); “1” = LED (output mode).
port (with/without pull-down resistor). “0” = Disabled
STOP Release
Enabled
Disabled S
b
0
0
3
I
/S
S
port. “0” = OFF (unavailable);
2
1
port input mode. “0” = OFF (unavailable);
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