4250 datasheet(6/59 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

4250 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MULTIFUNCTION

Multifunction

INT

TOUT

Multifunction

INT (Note 2)

TOUT (Note 2)

C (Note 2)

K (Note 2)

Notes 1: Pins except above have just single function.

2: The I/O of ports D2, D3 and G0, and the input of port G1 can be used even when ports C and K and pins INT and TOUT are

selected.

CONNECTIONS OF UNUSED PINS

F0, F1

G0/INT, G1/TOUT

G2, G3

S0–S3

Connection

Connect to VSS pin.

Open or connect to VSS pin. (Note 3)

D0, D1

D2/C, D3/K

Connection

Connect to VSS pin.

Open or connect to VSS pin. (Note 1)

Connect to VSS pin. (Note 2)

Notes 1: When pins G0/INT, G1/TOUT, G2 and G3 are connected to VSS pin, turn off their pull-up transistors (Pull-up control register

PU0=“!02”) and also invalidate the key-on wakeup functions of pins G1/TOUT, G2 and G3 (Key-on wakeup contorl register

K0=“!!0!2”) by software. When the POF instruction is executed while these pins are connected to VSS and the key-on

wakeup functions are left valid, the system returns from RAM back-up state by recognizing the return condition immediately

after going into the RAM back-up state. When these pins are open, turn on their pull-up transistors (Pull-up control register

PU0=“!12”) by software.

2: When ports S0–S3 are connected to VSS pin, invalidate the key-on wakeup functions (Key-on wakeup contorl register

K0=“!!!02”) by software. When the POF instruction is executed while these pins are connected to VSS and the key-on

wakeup functions are left valid, the system returns from RAM back-up state by recognizing the return condition immediately

after going into the RAM back-up state.

3: When ports D2/C and D3/K are connected to VSS pin, turn off their pull-up transistors (register PU0=“0!2”) by software.

When these pins are open, turn on their pull-up transistors (register PU0=“1!2”) by software.

(Note when connecting to VSS and VDD)

• Connect the unused pins to VSS or VDD at the shortest distance and use the thick wire against noise.

4250 Datasheet(PDF) 6 Page - Renesas Technology Corp

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