UPD6P9 datasheet(21/73 Pages) RENESAS

21 / 73 page

µPD67, 67A, 68, 68A, 69

Data Sheet U14935EJ2V1DS

3.4 Control Register 1 (P4)

Control register 1 consists of 8 bits. The contents that can be controlled are as shown below.

After reset, the register becomes 0010 0110B.

Table 3-5. Control Register 1 (P4)

Bit

Name

—

S0/S1

S1/LED

KI/O

Pull-down Pull-down STOP release mode

mode

Setting

Fixed

OFF

Disable

OFF

to 0

Enable

LED

OUT

After reset

00100110

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).

b3: Specified the use of STOP mode release by S2 port (with/without pull-down resistor). 0 = disable (without

pull-down); 1 = enable (with pull-down).

b4: Specifies the use of a pull-down resistor in S0/S1 port input mode. 0 = OFF (not used);

1 = ON (used)

b5: Specifies the use of a pull-down resistor for the KI port. 0 = OFF (not used);

1 = ON (used).

Remark In output mode or in OFF mode, all the pull-down resistors are automatically disconnected.

UPD6P9 Datasheet(PDF) 21 Page - Renesas Technology Corp