4501 查看數據表（PDF） - MITSUBISHI ELECTRIC

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4501

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4501 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION

Pin

Name

VDD

Power supply

VSS

Ground

CNVSS

CNVSS

RESET

Reset input/output

XIN

XOUT

D0–D3

System clock input

System clock output

I/O port D

P00–P03

I/O

P10–P13 I/O port P1

P20, P21 I/O port P2

Port C

I/O port C

Port K

I/O port K

CNTR

Timer input/output

INT

AIN0–AIN1

Interrupt input

Analog input

Input/Output

Function

—

Connected to a plus power supply.

—

Connected to a 0 V power supply.

—

Connect CNVSS to VSS and apply “L” (0V) to CNVSS certainly.

I/O

An N-channel open-drain I/O pin for a system reset. When the watchdog timer or the

voltage drop detection circuit cause the system to be reset, the RESET pin outputs

“L” level.

Input

Output

I/O pins of the system clock generating circuit. When using a ceramic resonator, connect

it between pins XIN and XOUT. A feedback resistor is built-in between them. When using

the RC oscillation, connect a resistor and a capacitor to XIN, and leave XOUT pin open.

I/O

Each pin of port D has an independent 1-bit wide I/O function. Each pin has an out-

put latch. For input use, set the latch of the specified bit to “1.” Input is examined by

skip decision. The output structure is N-channel open-drain. Ports D2 and D3 are

equipped with a pull-up function and a key-on wakeup function. Both functions can

be switched by software.

Ports D2 and D3 are also used as ports C and K, respectively.

I/O

Port P0 serves as a 4-bit I/O port, and it can be used as inputs when the output latch

is set to “1.” The output structure is N-channel open-drain. Port P0 has a key-on

wakeup function and a pull-up function. Both functions can be switched by software.

I/O

Port P1 serves as a 4-bit I/O port, and it can be used as inputs when the output latch

is set to “1.” The output structure is N-channel open-drain. Port P1 has a key-on

wakeup function and a pull-up function. Both functions can be switched by software.

Ports P12 and P13 are also used as CNTR and INT, respectively.

I/O

Port P2 serves as a 2-bit I/O port, and it can be used as inputs when the output latch

is set to “1.” The output structure is N-channel open-drain. Port P2 has a key-on

wakeup function and a pull-up function. Both functions can be switched by software.

Ports P20 and P21 are also used as AIN0 and AIN1, respectively.

I/O

1-bit I/O port. Port C can be used as inputs when the output latch is set to “1.” The

output structure is N-channel open-drain. Port C has a key-on wakeup function and

a pull-up function. Both functions can be switched by software. Port C is also used

as port D2.

I/O

1-bit I/O port. Port K can be used as inputs when the output latch is set to “1.” The

output structure is N-channel open-drain. Port K has a key-on wakeup function and

a pull-up function. Both functions can be switched by software. Port K is also used

as port D3.

I/O

CNTR pin has the function to input the clock for the timer 2 event counter, and to out-

put the timer 1 or timer 2 underflow signal divided by 2. This pin is also used as port

P12.

Input

INT pin accepts external interrupts. It has the key-on wakeup function which can be

switched by software. This pin is also used as port P13.

Input

A-D converter analog input pins. AIN0 and AIN1 are also used as ports P20 and P21,

respectively.

MULTIFUNCTION

Pin

D2

D3

P12

P13

Multifunction

C

K

CNTR

INT

Pin

C

K

CNTR

INT

Multifunction

D2

D3

P12

P13

Pin

P20

P21

Multifunction

AIN0

AIN1

Notes 1: Pins except above have just single function.

2: The input/output of D2, D3, P12 and P13 can be used even when C, K, INT and CNTR (input) are selected.

3: The input of P12 can be used even when CNTR (output) is selected.

4: The input/output of P20, P21 can be used even when AIN0, AIN1 are selected.

Pin

AIN0

AIN1

Multifunction

P20

P21

4

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