1996 Dec 18

3

Philips Semiconductors

Product specification

8-bit microcontroller with DTMF generator,

256 bytes EEPROM and real-time clock

PCD3350A

1

FEATURES

• 8-bit CPU, ROM, RAM, EEPROM, real-time clock and

I/O; all in a 44-lead quad flat package

• 8 kbytes ROM

• 256 bytes RAM

• 256 bytes Electrically Erasable Programmable Read

Only Memory (EEPROM)

• 32 kHz crystal oscillator for Real-Time Clock (RTC)

• EEPROM programmable RTC

• Over 100 instructions (based on MAB8048) all of

1 or 2 cycles

• 34 quasi-bidirectional I/O port lines

• 8-bit programmable Timer/event counter 1

• 8-bit reloadable Timer 2

• Three single-level vectored interrupts:

– external

– 8-bit programmable Timer/event counter 1

– derivative; triggered by reloadable Timer 2

• Two test inputs, one of which also serves as the external

interrupt input

• DTMF, modem, musical tone generator

• Reference for supply and temperature-independent

tone output

• Filtering for low output distortion (CEPT compatible)

• Melody output for ringer application

• Programmable DTMF clock divider

• Power-on-reset

• Stop and Idle modes

• Supply voltage: 1.8 to 6 V (DTMF tone output and

EEPROM erase/write from 2.5 V)

• CPU clock frequency: 1 to 16 MHz (3.58 MHz or

10.74 MHz for DTMF)

• Operating ambient temperature: −25 to +70 °C

• Manufactured in silicon gate CMOS process.

2

GENERAL DESCRIPTION

This data sheet details the specific properties of the

PCD3350A. The shared properties of the PCD33xxA

family of microcontrollers are described in the

“PCD33xxA

family” data sheet, which should be read in conjunction

with this publication.

The PCD3350A is a microcontroller designed primarily for

telephony applications. It includes 8 kbytes ROM,

256 bytes RAM, 34 I/O lines, and an on-chip generator for

dual tone multifrequency (DTMF), modem and musical

tones. In addition to dialling, the generated frequencies

can be made available as square waves for melody

generation, providing ringer operation.

The PCD3350A also incorporates 256 bytes of EEPROM,

permitting data storage without battery backup. The

EEPROM can be used for storing telephone numbers,

particularly for implementing redial functions.

Finally, the PCD3350A includes a low power 32 kHz

crystal oscillator with an EEPROM programmable

Real-Time Clock (RTC) working in standby mode.

The instruction set is similar to that of the MAB8048 and is

a sub-set of that listed in the

“PCD33xxA family” data

sheet.

3

ORDERING INFORMATION (see note 1)

Note

1. Please refer to the Order Entry Form (OEF) for this device for the full type number to use when ordering. This type

number will also specify the required program and the ROM mask options.

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCD3350AH

QFP44

plastic quad flat package; 44 leads (lead length 2.35 mm);

body 14

× 14 × 2.2 mm

SOT205-1