PD62A_15 Datasheet, PDF (20/64 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION

µPD62A
3.4 Control Register 1 (P4)
Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.
When reset, this register becomes 0010 0110B.
Table 3-6. Control Register 1 (P4)
Bit
Name
b7
—
Set
0
value
1
After reset
Fixed
to 0
0
b6
—
Fixed
to 0
0
b5
b4
b3
KI
S0/S1
—
Pull-down Pull-down
OFF OFF Fixed
ON
ON
to “0”
1
0
0
b2
b1
S1/LED KI/O
mode mode
S1
IN
LED OUT
1
1
b0
S0
mode
OFF
IN
0
b0: Specifies the input mode of the S0 port. “0” = OFF mode (high impedance); “1” = IN (input mode).
b1: Specifies the I/O mode of the KI/O port.
“0” = IN (input mode); “1” = OUT (output mode).
b2: Specifies the I/O mode of the S1/LED port. “0” = S1 (input mode); “1” = LED (output mode).
b4: Specifies the connection of a pull-down resistor in S0/S1 port input mode. “0” = OFF (not connected);
“1” = ON (connected)
b5: Specifies the connections of a pull-down resistor in KI port. “0” = OFF (not connected);
“1” = ON (connected).
Remark In output mode or in OFF mode, all the pull-down resistors are automatically disconnected.
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Data Sheet U14474EJ2V0DS00