Philips PCD3350A Datasheet

INTEGRATED CIRCUITS

DATA SH EET

PCD3350A

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

Product speciﬁcation Supersedes data of 1996 May 09 File under Integrated Circuits, IC03

1996 Dec 18

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

CONTENTS

1 FEATURES 2 GENERAL DESCRIPTION 3 ORDERING INFORMATION 4 BLOCK DIAGRAM 5 PINNING INFORMATION

5.1 Pinning

5.2 Pin description 6 FREQUENCY GENERATOR

6.1 Frequency generator derivative registers

6.2 Melody output (P1.7/MDY)

6.3 DTMF clock divider and output (DP1.7/DCO)

6.4 Frequency registers

6.5 DTMF frequencies

6.6 Modem frequencies

6.7 Musical scale frequencies 7 EEPROM AND TIMER 2 ORGANIZATION

7.1 EEPROM registers

7.2 EEPROM latches

7.3 EEPROM flags

7.4 EEPROM macros

7.5 EEPROM access

7.6 Timer 2 8 REAL-TIME CLOCK

8.1 Oscillator

8.2 Divider chain

8.3 Frequency adjustment

8.4 Real-time clock derivative registers

9 DERIVATIVE INTERRUPTS 10 TIMING 11 RESET 12 IDLE MODE 13 STOP MODE 14 SUMMARY OF I/O PORTS AND ROM MASK

15 SUMMARY OF DERIVATIVE REGISTERS 16 HANDLING 17 LIMITING VALUES 18 DC CHARACTERISTICS 19 AC CHARACTERISTICS 20 PACKAGE OUTLINES 21 SOLDERING

21.1 Introduction

21.2 Reflow soldering

21.3 Wave soldering

21.4 Repairing soldered joints 22 DEFINITIONS 23 LIFE SUPPORT APPLICATIONS

PCD3350A

OPTIONS

1996 Dec 18 2

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

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

PCD3350A

• 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

data sheet, which should be read in conjunction

family”

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 sheet.

“PCD33xxA family”

“PCD33xxA

data

3 ORDERING INFORMATION (see note 1)

TYPE NUMBER

NAME DESCRIPTION VERSION

PCD3350AH QFP44 plastic quad ﬂat package; 44 leads (lead length 2.35 mm);

body 14 × 14 × 2.2 mm

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.

1996 Dec 18 3

PACKAGE

SOT205-1

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

4 BLOCK DIAGRAM

WORD

STATUS

PROGRAM

LOWER

COUNTER

PROGRAM

HIGHER

COUNTER

PROGRAM

EVENT

TIMER/

COUNTER

CONTROL

& MELODY

DTMF-CLOCK

LGF

HGF

8 8

58888

BUFFER

DER. PORT 0

DP0.0/RCO to DP0.5

PORT 0

BUFFER

P0.0 to P0.7

ROM

8 kbytes

RESIDENT

PCD3350A

PORT 1

BUFFER

P1.0 to P1.7/MDY

BUFFER

DER. PORT 1

DP1.0 to DP1.7/DCO

DTMF

TONE

FILTER

4 8

PORT 2

BUFFER

P2.0 to P2.3

FLIP-FLOP

DER. PORT 0

PORT 0

FLIP-FLOP

DECODE

PORT 1

FLIP-FLOP

DER. PORT 1

PORT 2

FLIP-FLOP

BANK

MEMORY

FLIP-FLOPS

FREQ.

CLOCK

INTERNAL

SINE WAVE

GENERATOR

FREQUENCY

ADJUSTMENT

CLOCK

CONTROL

MULTIPLEXER

RAM

ADDRESS

TEMPORARY

timer interrupt

ACCUMULATOR

LOGIC

INTERRUPT

DATA

EEPROM

TRANSFER

EEPROM

ADDRESS

EEPROM

CONTROL

TIMER 2

RELOAD

REAL-TIME CLOCK

AND

INSTRUCTION

ARITHMETIC

interrupt

derivative

DIVIDER CHAIN

8 LEVEL STACK

(VARIABLE LENGTH)

DECOD

DECODER

LOGIC UNIT

TEMPORARY

EEPROM

REAL-TIME CLOCK

32 kHz OSCILLATOR

RTC1 RTC2

DATA STORE

OPTIONAL SECOND

FLAG

CE/T0

TIMER

BRANCH

CONDITIONAL

ADJUST

DECIMAL

RTC interrupt

external interrupt

256 bytes

POR

POWER-ON-RESET

256 bytes

RESIDENT RAM ARRAY

TEST

ACC BIT

ACC

CARRY

LOGIC

XTAL2XTAL1RESET

CONTROL AND TIMING

CE/T0

IDLE

STOP

RESET

PCD3350A

MED263

OSCILLATOR

handbook, full pagewidth

Fig.1 Block diagram.

INTERRUPT INITIALIZE

1996 Dec 18 4

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

5 PINNING INFORMATION

5.1 Pinning

handbook, full pagewidth

P1.6

P1.7/MDY 43

P1.5

P1.4

PCD3350AH

P2.1 P2.2 P2.3

DP0.0/RCO

DP0.1 DP0.2 DP0.3 DP0.4 DP0.5

RTC1 RTC2

P2.0 44

1 2 3 4 5 6 7 8

9 10 11

P1.3 39

PCD3350A

TONE

V 38

P1.1

P1.2

P1.0 P0.7

32 31

P0.6

P0.5 P0.4

29 28

XTAL2 XTAL1

P0.3

P0.2

25 24

P0.1 P0.0

CE/T0

DP1.0

RESET

DP1.1

Fig.2 Pin configuration.

DP1.2

DP1.3

DP1.4

DP1.5

DP1.6

MED264

DP1.7/DCO

1996 Dec 18 5

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator,

PCD3350A

256 bytes EEPROM and real-time clock

5.2 Pin description Table 1 SOT205-1 package (for information on parallel I/O ports, see Chapter 14)

SYMBOL PIN TYPE DESCRIPTION

P2.1 to P2.3 1 to 3 I/O 3 bits of Port 2: 4-bit quasi-bidirectional I/O port DP0.0/RCO 4 I/O 1 bit of Derivative Port 0: 6-bit quasi-bidirectional I/O port; or RTC output DP0.1 to DP0.5 5 to 9 I/O 5 bits of Derivative Port 0: 6-bit quasi-bidirectional I/O port RTC1 10 I Real Time Clock 32 kHz oscillator input RTC2 11 O Real Time Clock 32 kHz oscillator output CE/

T0 12 I Chip Enable or Test 0 input T1 13 I Test 1/count input of 8-bit Timer/event counter 1 RESET 14 I reset input DP1.0 to DP1.6 15 to 21 I/O 7 bits of Derivative Port 1: 8-bit quasi-bidirectional I/O port DP1.7/DCO 22 I/O 1 bit of Derivative Port 1: 8-bit quasi-bidirectional I/O port; or DTMF clock

output P0.0 to P0.3 23 to 26 I/O 4 bits of Port 0: 8-bit quasi-bidirectional I/O port XTAL1 27 I crystal oscillator/external clock input XTAL2 28 O crystal oscillator output P0.4 to P0.7 29 to 32 I/O 4 bits of Port 0: 8-bit quasi-bidirectional I/O port P1.0 to P1.2 33 to 35 I/O 3 bits of Port 1: 8-bit quasi-bidirectional I/O port V

TONE 37 O DTMF output V

P1.3 to P1.6 39 to 42 I/O 4 bits of Port 1: 8-bit quasi-bidirectional I/O port P1.7/MDY 43 I/O 1 bit of Port 1: 8-bit quasi-bidirectional I/O port; or melody output P2.0 44 I/O 1 bit of Port 2: 4-bit quasi-bidirectional I/O port

36 P ground

38 P positive supply voltage

1996 Dec 18 6

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator,

PCD3350A

256 bytes EEPROM and real-time clock

6 FREQUENCY GENERATOR

A versatile frequency generator section with built-in programmable clock divider is provided (see Fig.3). The clock divider allows the DTMF section to run either with the main clock frequency (f of it (f

DTMF

=1⁄3× f

) depending on the state of the divider

xtal

DTMF=fxtal

) or with a third

control bit DIV3 (see Table 4). The frequency generator includes precision circuitry for dual tone multifrequency (DTMF) signals, which is typically used for tone dialling telephone sets.

6.1 Frequency generator derivative registers

6.1.1 H

IGH AND LOW GROUP FREQUENCY REGISTERS

Table 2 gives the addresses, symbols and access types of the High Group Frequency (HGF) and Low Group Frequency (LGF) registers, used to set the frequency output.

Table 2 Hexadecimal addresses, symbols, access types and bit symbols of the frequency registers

ADDRESS

SYMBOL

ACCESS

TYPE

7 6 5 4 3 2 1 0

11H HGF W H7H6H5H4H3H2H1H0 12H LGF W L7L6L5L4L3L2L1L0

The TONE output can alternatively issue twelve modem frequencies for data rates between 300 and 1200 bits/s.

In addition to DTMF and modem frequencies, two octaves of musical scale in steps of semitones are available. Their frequencies are provided either in purely sinusoidal form on the TONE output or as a square wave on the port line P1.7/MDY. The latter is typically for ringer applications in telephone sets. If no frequency output is selected the TONE output is in 3-state mode.

BIT SYMBOLS

6.1.2 CLOCK AND MELODY CONTROL REGISTER (MDYCON)

Table 3 Clock and Melody Control Register, MDYCON (address 13H; access type R/W)

7 6 5 4 3 2 1 0

00000EDCO DIV3 EMO

Table 4 Description of MDYCON bits

BIT SYMBOL DESCRIPTION

7to3 − These bits are set to a logic 0.

2 EDCO Enable DTMF clock output. If bit EDCO = 0, then DP1.7/DCO is a general purpose

derivative port line. If bit EDCO = 1, then DP1.7/DCO is the DTMF clock output. EDCO = 1 does not inhibit the port instructions for DP1.7/DCO. Therefore the state of both port line and flip-flop may be read in and the port flip-flop may be written by derivative port instructions. However, the port flip-flop of DP1.7/DCO must remain set to avoid conflicts between DTMF clock and port outputs.

1 DIV3 Enable DTMF clock divider. If bit DIV3 = 0, then the DTMF clock f

If bit DIV3 = 1, then f

DTMF

=1⁄3× f

xtal

DTMF=fxtal

0 EMO Enable Melody Output. If bit EMO = 0, then P1.7/MDY is a standard port line.

If bit EMO = 1, then P1.7/MDY is the melody output. EMO = 1 does not inhibit the port instructions for P1.7/MDY. Therefore the state of both port line and flip-flop may be read in and the port flip-flop may be written by port instructions. However, the port flip-flop of P1.7/MDY must remain set to avoid conflicts between melody and port outputs. When the HGF contents are zero while EMO = 1, P1.7/MDY is in the HIGH state.

1996 Dec 18 7

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

handbook, full pagewidth

INTERNAL BUS

xtal

CLOCK AND MELODY

CONTROL REGISTER

HGF REGISTER

LGF REGISTER

CLOCK

DIVIDER

DIGITAL

SINE WAVE

SYNTHESIZER

SWITCHED

CAPACITOR

BANDGAP VOLTAGE

REFERENCE

DIGITAL

SINE WAVE

SYNTHESIZER

square wave

DAC

DTMF

SWITCHED

CAPACITOR

LOW-PASS

FILTER

PCD3350A

PORT/CLOCK

OUTPUT LOGIC

PORT/MELODY OUTPUT LOGIC

RC LOW-PASS

FILTER

MGB782

DP1.7/

DCO

P1.7/ MDY

TONE

Fig.3 Block diagram of the frequency generator, melody output (P1.7/MDY) and DTMF clock output

(DP1.7/DCO).

6.2 Melody output (P1.7/MDY)

The melody output (P1.7/MDY) is very useful for generating musical notes when a purely sinusoidal signal is not required, such as for ringer applications.

The square wave (duty cycle =12⁄23 or 52%) will include the attenuated harmonics of the base frequency, which is defined by the contents of the HGF register (Table 2). However, even higher frequency notes may be produced since the low-pass filtering on the TONE output is not applied to the P1.7/MDY output. This results in the minimum decimal value x in the HGF register (see equation in Section 6.4) being 2 for the P1.7/MDY output, rather than 60 for the TONE output. A sinusoidal TONE output is produced at the same time as the melody square wave, but due to the filtering, the higher frequency sine waves produced when x < 60 will not appear at the TONE output.

Since the melody output is shared with P1.7, the port flip-flop of P1.7 has to be set HIGH before using the

6.3 DTMF clock divider and output (DP1.7/DCO)

The DTMF clock divider allows the DTMF part to run either with the main clock frequency (f of it (f

DTMF

=1⁄3× f

) depending on the state of the divider

xtal

DTMF=fxtal

control bit DIV3 in register MDYCON. For low power applications, a 3.58 MHz quartz crystal or

PXE resonator can be chosen together with the divide-by-one function of the clock divider.

For other applications a 10.74 MHz quartz crystal or PXE resonator may be chosen together with the divide-by-three function of the clock divider. This triples the program speed of the microcontroller, thereby keeping the assumed DTMF frequency of 3.58 MHz.

Since a 3.58 MHz clock is needed for peripheral telephony circuits such as the analog voice scrambler/descrambler PCD4440T, a switchable DTMF clock output is provided depending on the state of the enable clock output bit EDCO in register MDYCON.

melody output. This is to avoid conflicts between melody and port outputs. The melody output drive depends on the configuration of port P1.7/MDY, see Chapter 14, Table 27.

) or with a third

1996 Dec 18 8

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

If EDCO = 1 and DIV3 = 1 in the MDYCON register: a square wave with the frequency f on the derivative port line DP1.7/DCO. If EDCO = 1 and DIV3 = 0: a square wave with the frequency f output on the derivative port line DP1.7/DCO.

The melody output drive depends on the configuration of port P1.7/MDY, see Chapter 14, Table 27.

6.4 Frequency registers

The two frequency registers HGF and LGF define two frequencies. From these, the digital sine synthesizers together with the Digital-to-Analog Converters (DACs) construct two sine waves. Their amplitudes are precisely scaled according to the bandgap voltage reference. This ensures tone output levels independent of supply voltage and temperature. The amplitude of the Low Group Frequency sine wave is attenuated by 2 dB compared to the amplitude of the High Group Frequency sine wave.

The two sine waves are summed and then filtered by an on-chip switched capacitor and RC low-pass filters. These guarantee that all DTMF tones generated fulfil the CEPT recommendations with respect to amplitude, frequency deviation, total harmonic distortion and suppression of unwanted frequency components.

The value 00H in a frequency register stops the corresponding digital sine synthesizer. If both frequency registers contain 00H, the whole frequency generator is shut off, resulting in lower power consumption.

The frequency ‘f’ of the sine wave generated from either of the frequency registers is a function of the clock frequency

’ and the decimal value ‘x’ held in the register.

‘f

xtal

The equation relating these variables is:

The frequency limitation given by x ≥ 60 is due to the low-pass filters which would attenuate higher frequency sine waves.

6.5 DTMF frequencies

Assuming an oscillator frequency f DTMF standard frequencies can be implemented as shown in Table 5.

xtal

-------------------------------23 x 2+()[]

; where 60 ≤ x ≤ 255.

=1⁄3× f

DTMF

= 3.58 MHz, the

xtal

is output

xtal

DTMF=fxtal

PCD3350A

The relationships between telephone keyboard symbols, DTMF frequency pairs and the frequency register contents are given in Table 6.

Table 5 DTMF standard frequencies and their

implementation; value = LGF, HGF contents

VALUE

(HEX)

DD 697 697.90 0.13 0.90

C8 770 770.46 0.06 0.46 B5 852 850.45 −0.18 −1.55 A3 941 943.23 0.24 2.23 7F 1209 1206.45 −0.21 −2.55

72 1336 1341.66 0.42 5.66 67 1477 1482.21 0.35 5.21

5D 1633 1638.24 0.32 5.24

Table 6 Dialling symbols, corresponding DTMF

TELEPHONE

KEYBOARD

SYMBOLS

0 (941, 1336) A3 72 1 (697, 1209) DD 7F 2 (697, 1336) DD 72 3 (697, 1477) DD 67 4 (770, 1209) C8 7F 5 (770, 1336) C8 72 6 (770, 1477) C8 67 7 (852, 1209) B5 7F 8 (852, 1336) B5 72 9 (852, 1477) B5 67 A (697, 1633) DD 5D B (770, 1633) C8 5D C (852, 1633) B5 5D D (941, 1633) A3 5D

• (941, 1209) A3 7F

# (941, 1477) A3 67

FREQUENCY (Hz) DEVIATION

STANDARD GENERATED (%) (Hz)

frequency pairs and frequency register contents

DTMF FREQ.

PAIRS

(Hz)

LGF

VALUE

(HEX)

HGF

VALUE

(HEX)

1996 Dec 18 9

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

6.6 Modem frequencies

Again assuming an oscillator frequency f the standard modem frequencies can be implemented as in Table 7. It is suggested to define the frequency by the HGF register while the LGF register contains 00H, disabling Low Group Frequency generation.

Table 7 Standard modem frequencies and their

implementation

HGF

FREQUENCY (Hz) DEVIATION

VALUE

(HEX)

9D 980

82 1180

8F 1070

79 1270 80 1200 45 2200 76 1300 48 2100

5C 1650

52 1850

4B 2025

44 2225

MODEM GENERATED (%) (Hz)

(1)

(1) (2) (2) (3) (3) (4) (4) (1) (1) (2) (2)

978.82 −0.12 −1.18

1179.03 −0.08 −0.97

1073.33 0.31 3.33

1265.30 −0.37 −4.70

1197.17 −0.24 −2.83

2192.01 −0.36 −7.99

1296.94 −0.24 −3.06

2103.14 0.15 3.14

1655.66 0.34 5.66

1852.77 0.15 2.77

2021.20 −0.19 −3.80

2223.32 −0.08 −1.68

Notes

1. Standard is V.21.

2. Standard is Bell 103.

3. Standard is Bell 202.

4. Standard is V.23.

6.7 Musical scale frequencies

= 3.58 MHz,

xtal

PCD3350A

Table 8 Musical scale frequencies and their

implementation

HGF

NOTE

VALUE

(HEX)

D#5 F8 622.3 622.5

E5 EA 659.3 659.5 F5 DD 698.5 697.9

F#5 D0 740.0 741.1

G5 C5 784.0 782.1

G#5 B9 830.6 832.3

A5 AF 880.0 879.3

A#5 A5 923.3 931.9

B5 9C 987.8 985.0

C6 93 1046.5 1044.5

C#6 8A 1108.7 1111.7

D6 82 1174.7 1179.0

D#6 7B 1244.5 1245.1

E6 74 1318.5 1318.9 F6 6D 1396.9 1402.1

F#6 67 1480.0 1482.2

G6 61 1568.0 1572.0

G#6 5C 1661.2 1655.7

A6 56 1760.0 1768.5

A#6 51 1864.7 1875.1

B6 4D 1975.5 1970.0

C7 48 2093.0 2103.3

C#7 44 2217.5 2223.3

D7 40 2349.3 2358.1

D#7 3D 2489.0 2470.4

FREQUENCY (Hz)

STANDARD

(1)

GENERATED

Finally, two octaves of musical scale in steps of semitones can be realized, again assuming an oscillator frequency f

= 3.58 MHz (Table 8). It is suggested to define the

xtal

frequency by the HGF register while the LGF contains 00H, disabling Low Group Frequency generation.

1996 Dec 18 10

Note

1. Standard scale based on A4 @ 440 Hz.

Philips Semiconductors Product speciﬁcation

8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock

7 EEPROM AND TIMER 2 ORGANIZATION

The PCD3350A has 256 bytes of Electrically Erasable Programmable Read Only Memory (EEPROM). Such non-volatile storage provides data retention without the need for battery backup. In telecom applications, the EEPROM is used for storing redial numbers and for short dialling of frequently used numbers. More generally, EEPROM may be used for customizing microcontrollers, such as to include a PIN code or a country code, to define trimming parameters, to select application features from the range stored in ROM.

The most significant difference between a RAM and an EEPROM is that a bit in EEPROM, once written to a logic 1, cannot be cleared by a subsequent write operation. Successive write accesses actually perform a logical OR with the previously stored information. Therefore, to clear a bit, the whole byte must be erased and re-written with the particular bit cleared. Thus, an erase-and-write operation is the EEPROM equivalent of a RAM write operation.

PCD3350A

Whereas read access times to an EEPROM are comparable to RAM access times, write and erase access times are much slower at 5 ms each. To make these operations more efficient, several provisions are available in the PCD3350A.

First, the EEPROM array is structured into 64 four-byte pages (see Fig.4) permitting access to 4 bytes in parallel (write page, erase/write page and erase page). It is also possible to erase and write individual bytes.

Finally, the EEPROM address register provides auto-incrementing, allowing very efficient read and write accesses to sequential bytes.

To simplify the erase and write timing, the derivative 8-bit down-counter (Timer 2) with reload register is provided. In addition to EEPROM timing, Timer 2 can be used for general real-time tasks, such as for measuring signal duration and for defining pulse widths.

1996 Dec 18 11

+ 25 hidden pages