4501 查看數據表（PDF） - MITSUBISHI ELECTRIC

零件编号

产品描述 (功能)

比赛名单

4501

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

4501 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

DEFINITION OF CLOCK AND CYCLE

q Operation source clock

The operation source clock is the source clock to operate this

product. In this product, the following clocks are used.

• External ceramic resonator

• External RC oscillation

• Clock (f(XIN)) by the external clock

• Clock (f(RING)) of the ring oscillator which is the internal oscil-

lator.

q System clock

The system clock is the basic clock for controlling this product.

The system clock is selected by the bits 2 and 3 of the clock con-

trol register MR.

q Instruction clock

The instruction clock is a signal derived by dividing the system

clock by 3. The one instruction clock cycle generates the one

machine cycle.

q Machine cycle

The machine cycle is the standard cycle required to execute the

instruction.

Table Selection of system clock

Register MR

System clock

MR3 MR2

(Note 1)

0

0 f(XIN) or f(RING)

0

1 f(XIN)/2 or f(RING)/2

1

0 f(XIN)/4 or f(RING)/4

1

1 f(XIN)/8 or f(RING)/8

Operation mode

High-speed mode

Middle-speed mode

Low-speed mode

Default mode

Notes 1: The ring oscillator clock is f(RING), the clock by the ce-

ramic resonator, RC oscillation or external clock is f(XIN).

2: The default mode is selected after system is released

from reset and is returned from RAM back-up.

PORT FUNCTION

Port

Pin

Port D

D0, D1

D2/C

D3/K

Port P0 P00–P03

Port P1 P10, P11

P12/CNTR,

P13/INT

Port P2 P20/AIN0

P21/AIN1

Input

Output

I/O

(4)

I/O

(4)

I/O

(4)

I/O

(2)

Output structure

I/O

Control

Control

unit instructions registers

N-channel open-drain 1 SD, RD

SZD, CLD PU2, K2

SCP, RCP

SNZCP

IAK, OKA

N-channel open-drain 4 OP0A

IAP0

PU0, K0

N-channel open-drain 4 OP1A

IAP1

PU1, K1

W6, I1

N-channel open-drain 2 OP2A

IAP2

PU2, K2

Q1

Remark

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

Built-in programmable pull-up

functions

Key-on wakeup functions

(programmable)

5

Share Link: