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4501

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4501 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

CONNECTIONS OF UNUSED PINS

Pin

Connection

XIN

Connect to VSS.

XOUT

Open.

D0, D1

D2/C

D3/K

P00–P03

P10, P11

P12/CNTR

P13/INT

Open. (Output latch is set to “1.”)

Open. (Output latch is set to “0.”)

Connect to VSS.

Open. (Output latch is set to “1.”)

Open. (Output latch is set to “0.”)

Connect to VSS.

Open. (Output latch is set to “1.”)

Open. (Output latch is set to “0.”)

Connect to VSS.

Open. (Output latch is set to “1.”)

Open. (Output latch is set to “0.”)

Connect to VSS.

Open. (Output latch is set to “1.”)

P20/AIN0

P21/AIN1

Open. (Output latch is set to “0.”)

Connect to VSS.

Open. (Output latch is set to “1.”)

Open. (Output latch is set to “0.”)

Connect to VSS.

Usage condition

System operates by the ring oscillator. (Note 1)

System operates by the external clock.

(The ceramic resonator is selected with the CMCK instruction.)

System operates by the RC oscillator.

(The RC oscillation is selected with the CRCK instruction.)

System operates by the ring oscillator. (Note 1)

The key-on wakeup function is not selected. (Note 4)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The key-on wakeup function is not selected. (Note 4)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The key-on wakeup function is not selected. (Note 4)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The key-on wakeup function is not selected. The input to INT pin is disabled.

(Notes 4, 5)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The key-on wakeup function is not selected. (Note 4)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

The pull-up function and the key-on wakeup function are not selected. (Notes 2, 3)

Notes 1: When the ceramic resonator or the RC oscillation is not selected by program, system operates by the ring oscillator (internal oscillator).

2: When the pull-up function is left valid, the supply current is increased. Do not select the pull-up function.

3: When the key-on wakeup function is left valid, the system returns from the RAM back-up state immediately after going into the RAM back-up state.

Do not select the key-on wakeup function.

4: When selecting the key-on wakeup function, select also the pull-up function.

5: Clear the bit 3 (I13) of register I1 to “0” to disable to input to INT pin (after reset: I13 = “0”)

(Note when connecting to VSS and VDD)

q Connect the unused pins to VSS and VDD using the thickest wire at the shortest distance against noise.

6

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