4551 datasheet(15/155 Pages) RENESAS

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4551 Group User’s Manual

HARDWARE

1-3

DESCRIPTION

The 4551 Group is a 4-bit single-chip microcomputer designed

with CMOS technology. Its CPU is that of the 4500 series using

a simple, high-speed instruction set. The computer is equipped

with an 8-bit timer with a reload register, a 14-bit timer which is

also used as a watchdog timer, a 4-bit timer with a reload register,

a carrier wave output circuit and an LCD control circuit.

The mask ROM version and built-in PROM version of 4551 Group

are produced as shown in the table below.

FEATURES

q Minimum instruction execution time ............................ 1.5

µs

(f(XIN)=8.0 MHz, VDD=5.0 V, system clock = f(XIN)/4)

q Supply voltage

............................. 2.5 V to 5.5 V (One Time PROM version)

....................................... 2.2 V to 5.5 V (Mask ROM version)

q System clock switch function

........................................... Clock divided by 4 or not divided

q LCD control circuit

Segment output .................................................................. 20

Common output .................................................................... 4

q Carrier wave frequency switch function

System clock, system clock/2, system clock/8,

system clock/12, system clock/16, system clock/24, “H” fixed

q Timers

Timer 1 ................................ 8-bit timer with a reload register

Timer 2 ............... 14-bit timer also used as a watchdog timer

Timer LC ............................. 4-bit timer with a reload register

q Interrupt ................................................................... 3 sources

q Voltage drop detection circuit ............................................... 1

q Clock generating circuit (ceramic resonance and quartz-crystal

oscillation)

APPLICATION

Remote control transmitter

Product

M34551M4-XXXFP

M34551M8-XXXFP

(Note 1)

M34551E8-XXXFP

(Note 2)

ROM type

Mask ROM

One Time PROM

Package

48P6S-A

RAM size

(! 4 bits)

280 words

ROM (PROM) size

(! 10 bits)

4096 words

8192 words

Notes 1: Under development (Aug. 1998)

2: Shipped after writing (shipped in blank: M34551E8FP)

PIN CONFIGURATION (TOP VIEW)

M34551Mx-XXXFP

Outline 48P6S-A

DESCRIPTION/FEATURES/APPLICATION/PIN CONFIGURATION

M34551Mx-XXXFP

SEG11

SEG14

SEG15

SEG9

VSS

XOUT

XIN

D7/XCOUT

D6/XCIN

CARR

VDD

CNVSS

VSS

D5 / INT

SEG10

SEG13

SEG12

P20 / SEG16

P21 / SEG17

4551 Datasheet(PDF) 15 Page - Renesas Technology Corp

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