Philips PCD3755AH, PCD3755AP, PCD3755AT, PCD3755FP, PCD3755EH Datasheet

INTEGRATED CIRCUITS

DATA SHEET

PCD3755A; PCD3755E; PCD3755F

8-bit microcontrollers with DTMF generator, 8 kbytes OTP and 128 bytes EEPROM

Product specification

1997 Apr 16

Supersedes data of 1996 Dec 18

File under Integrated Circuits, IC03

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

CONTENTS

1FEATURES

2GENERAL DESCRIPTION

3ORDERING INFORMATION

4BLOCK DIAGRAM

5PINNING INFORMATION

5.1Pinning

5.2Pin description

6	FREQUENCY GENERATOR

6.1Frequency generator derivative registers

6.2Melody output (P1.7/MDY)

6.3Frequency registers

6.4DTMF frequencies

6.5Modem frequencies

6.6Musical scale frequencies

7	EEPROM AND TIMER 2 ORGANIZATION

7.1EEPROM registers

7.2EEPROM latches

7.3EEPROM flags

7.4EEPROM macros

7.5EEPROM access

7.6Timer 2

8DERIVATIVE INTERRUPTS

9TIMING

10RESET

11IDLE MODE

12STOP MODE

13INSTRUCTION SET RESTRICTIONS

14OVERVIEW OF PORT AND POWER-ON-RESET CONFIGURATION

15OTP PROGRAMMING

16SUMMARY OF DERIVATIVE REGISTERS

17HANDLING

18LIMITING VALUES

19DC CHARACTERISTICS

20AC CHARACTERISTICS

21PACKAGE OUTLINES

22SOLDERING

22.1Reflow soldering

22.2Wave soldering

22.3DIP

22.4Repairing soldered joints

23DEFINITIONS

24LIFE SUPPORT APPLICATIONS

1997 Apr 16

2

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

1 FEATURES

∙8-bit CPU, ROM, RAM, EEPROM and I/O; in a single 28-lead or 32-lead package

∙8 kbytes user-programmable ROM (One-Time Programmable)

∙128 bytes RAM

∙128 bytes Electrically Erasable Programmable Read-Only Memory (EEPROM)

∙Over 100 instructions (based on MAB8048) all of 1 or 2 cycles

∙20 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

∙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)

∙Clock frequency: 1 to 16 MHz (3.58 MHz for DTMF suggested)

∙Operating temperature: −25 to +70 °C

∙Manufactured in silicon gate CMOS process.

3 ORDERING INFORMATION (see note 1)

2 GENERAL DESCRIPTION

This data sheet details the specific properties of the PCD3755A, PCD3755E and PCD3755F. The devices differ in their Port and Power-on-reset configurations. References to ‘PCD3755x’ apply to all three types. The devices are members of the PCD33xxA family of microcontrollers.

The shared properties of the family are described in the “PCD33xxA family” data sheet, which should be read in conjunction with this publication.

The PCD3755A, PCD3755E and PCD3755F are One-Time Programmable (OTP) microcontrollers designed primarily for telephony applications.They include an on-chip generator for dual tone multifrequency (DTMF), modem and musical tones. In addition to dialling, generated frequencies can be made available as square waves (P1.7/MDY) for melody generation, providing ringer operation.

The PCD3755A, PCD3755E and PCD3755F also incorporate 128 bytes of EEPROM. The EEPROM can be used for storing telephone numbers, particularly for implementing redial functions.

The Power-on-reset circuitry is extra accurate to accommodate parallel telephones and fax equipment.

The instruction set is similar to that of the MAB8048 and is a sub-set of that listed in the “PCD33xxA family” data sheet.

	TYPE NUMBER		PACKAGE
		NAME	DESCRIPTION	VERSION
	PCD3755xP	DIP28	plastic dual in-line package; 28 leads (600 mil)	SOT117-1
	PCD3755xT	SO28	plastic small outline package; 28 leads; body width 7.5 mm	SOT136-1
	PCD3755xH	LQFP32	plastic low profile quad flat package; 32 leads; body 7 × 7 × 1.4 mm	SOT358-1

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.

1997 Apr 16

3

_

16 Apr 1997

P2.0 to P2.3

TONE

P1.0 to P1.6

P0.0 to P0.7

P1.7/MDY

4

7

RESIDENT

8

PORT 2

PORT 1

OTP-ROM

PORT 0

BUFFER

FILTER

BUFFER

8 kbytes

BUFFER

PORT 2

PORT 1

PORT 0

FLIP-FLOP

FLIP-FLOP

DECODE

FLIP-FLOP

SINE WAVE

INTERNAL

MEMORY

GENERATOR

CLOCK

BANK

FREQ.

FLIP-FLOPS

30

MELODY

32

TIMER/

HIGHER

LOWER

PROGRAM

HGF

LGF

EVENT

PROGRAM

PROGRAM

STATUS

CONTROL

REGISTER

REGISTER

T1

COUNTER

COUNTER

COUNTER

WORD

REGISTER

4

8

8

8

8

PCD3755x

8

5

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

8

4

TIMER 2

TIMER 2

EEPROM

EEPROM

EEPROM

INTERRUPT

ACCUMULATOR

TEMPORARY

TEMPORARY

MULTIPLEXER

RELOAD

CONTROL

ADDRESS

DATA

REGISTER

LOGIC

REGISTER 2

REGISTER 1

REGISTER 0

REGISTER

REGISTER

REGISTER

TRANSFER

REGISTER 1

RAM

REGISTER 2

timer interrupt

ADDRESS

derivative

REGISTER

REGISTER 3

INSTRUCTION

REGISTER 4

interrupt

ARITHMETIC

REGISTER

REGISTER 5

AND

D

REGISTER 6

DECODER

E

REGISTER 7

C

EEPROM

8 LEVEL STACK

O

128 bytes

(VARIABLE LENGTH)

T 1

D

POWER-ON-RESET

VPOR

LOGIC UNIT

OPTIONAL SECOND

E

CONDITIONAL

CE/T0

REGISTER BANK

external interrupt

TIMER

DECIMAL

RESET

BRANCH

FLAG

ADJUST

DATA STORE

CARRY

LOGIC

STOP

CONTROL AND TIMING

ACC

IDLE

ACC BIT

RESIDENT RAM ARRAY

CE/T0

RESET

XTAL1

XTAL2

TEST

128 bytes

MBG639

INTERRUPT

INITIALIZE

OSCILLATOR

Fig.1 Block diagram.

DIAGRAM BLOCK 4

generator, DTMF with microcontrollers bit-8 EEPROM bytes 128 and OTP kbytes 8

PCD3755F

PCD3755E; PCD3755A;

Semiconductors Philips

specification Product

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

5 PINNING INFORMATION

5.1Pinning

P0.1			1			P0.0
					28
			2
P0.2					27	P2.3
P0.3			3			P2.2
					26
			4
P0.4					25	P2.1
			5			VDD
P0.5					24
			6
P0.6					23	TONE
			7			VSS
P0.7				PCD3755xP	22
			8	PCD3755xT
T1					21	P2.0
			9
XTAL1					20	P1.7/MDY
			10
XTAL2					19	P1.6
			11
RESET					18	P1.5
			12
CE/T0					17	P1.4
			13
P1.0					16	P1.3
P1.1			14		15	P1.2

MBG640

Fig.2 Pin configuration (SOT117-1 and SOT136-1).

P0.4		P0.3		P0.2		P0.1		n.c.		P0.0		P2.3		P2.2
32		31		30		29		28		27		26		25

n.c. 1

P0.5 2

P0.6 3

P0.7 4

PCD3755xH

T1 5

XTAL1 6

XTAL2 7

RESET 8

	9			10		11		12		13		14		15		16
		CE/T0		P1.0		P1.1		P1.2		n.c.		P1.3		P1.4		P1.5

24 P2.1

23 VDD

22 TONE

21 VSS

20 P2.0

19 P1.7/MDY

18 P1.6

17 n.c.

MBG641

Fig.3 Pin configuration (SOT358-1).

1997 Apr 16

5

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

5.2Pin description

Table 1 SOT117-1 and SOT136-1 packages (for information on parallel I/O ports, see Chapter 14)

SYMBOL			PIN	TYPE	DESCRIPTION
P1.1 to P0.7			1 to 7	I/O	7 bits of Port 0: 8-bit quasi-bidirectional I/O port
T1			8	I	Test 1 or count input of 8-bit Timer/event counter 1
XTAL1			9	I	crystal oscillator or external clock input
XTAL2			10	O	crystal oscillator output
RESET			11	I	reset input
			12	I	Chip Enable or Test 0
CE/T0
P1.0 to P1.6			13 to 19	I/O	7 bits of Port 1: 8-bit quasi-bidirectional I/O port
P1.7/MDY			20	I/O	1 bit of Port 1: 8-bit quasi-bidirectional I/O port; or melody output
P2.0			21	I/O	1 bit of Port 2: 4-bit quasi-bidirectional I/O port
VSS			22	P	ground
TONE			23	O	DTMF output
VDD			24	P	positive supply voltage
P2.1 to P2.3			25 to 27	I/O	3 bits of Port 2: 4-bit quasi-bidirectional I/O port
P0.0			28	I/O	1 bit of Port 0: 8-bit quasi-bidirectional I/O port
Table 2 SOT358-1 package (for information on parallel I/O ports, see Chapter 14)
SYMBOL			PIN	TYPE	DESCRIPTION
n.c.			1, 13, 17, 28	−	not connected
P0.5 to P0.7			2 to 4	I/O	3 bits of Port 0: 8-bit quasi-bidirectional I/O port
T1			5	I	Test 1 or count input of 8-bit Timer/event counter 1
XTAL1			6	I	crystal oscillator or external clock input
XTAL2			7	O	crystal oscillator output
RESET			8	I	reset input
			9	I	Chip Enable or Test 0
CE/T0
P1.0 to P1.6			10 to 12,	I/O	7 bits of Port 1: 8-bit quasi-bidirectional I/O port
			14 to 16, 18
P1.7/MDY			19	I/O	1 bit of Port 1: 8-bit quasi-bidirectional I/O port; or melody output
P2.0			20	I/O	1 bit of Port 2: 4-bit quasi-bidirectional I/O port
VSS			21	P	ground
TONE			22	O	DTMF output
VDD			23	P	positive supply voltage
P2.1 to P2.3			24 to 26	I/O	3 bits of Port 2: 4-bit quasi-bidirectional I/O port
P0.0 to P0.4			27, 29 to 32	I/O	5 bits of Port 0: 8-bit quasi-bidirectional I/O port

1997 Apr 16

6

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

6 FREQUENCY GENERATOR

A versatile frequency generator section is provided (see Fig.4). For normal operation, use a 3.58 MHz quartz crystal or PXE resonator. The frequency generator includes precision circuitry for dual tone multifrequency (DTMF) signals, which is typically used for tone dialling telephone sets.

Their frequencies are provided in purely sinusoidal form on the TONE output or as square waves on the P1.7/MDY output.

6.1Frequency generator derivative registers

6.1.1HIGH AND LOW GROUP FREQUENCY REGISTERS

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.

In case no tones are generated the TONE output is in 3-state mode.

Table 3 gives the addresses, mnemonics and access types of the High Group Frequency (HGF) and Low Group Frequency (LGF) registers.

Table 3 Hexadecimal addresses, mnemonics, access types and bit mnemonics of the frequency registers

REGISTER

REGISTER

ACCESS

BIT MNEMONICS

ADDRESS

MNEMONIC

TYPE

7

6

5

4

3

2

1

0

11H

HGF

W

H7

H6

H5

H4

H3

H2

H1

H0

12H

LGF

W

L7

L6

L5

L4

L3

L2

L1

L0

6.1.2 MELODY CONTROL REGISTER (MDYCON)

MDYCON is a R/W register.

Table 4 Melody Control Register (address 13H)

7

6

5

4

3

2

1

0

0

0

0

0

0

0

0

EMO

Table 5 Description of MDYCON bits

BIT

MNEMONIC

DESCRIPTION

7 to 1

−

These bits are set to a logic 0.

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 logic HIGH state.

1997 Apr 16

7

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

handbook, full pagewidth
	8	MELODY CONTROL
		REGISTER
	8	HGF REGISTER
8	INTERNAL BUS
	8	LGF REGISTER

PORT/MELODY

P1.7/

OUTPUT LOGIC

MDY

square wave

DIGITAL

SINE WAVE

SYNTHESIZER

DAC

SWITCHED

SWITCHED

CAPACITOR

CAPACITOR

RC LOW-PASS

TONE

BANDGAP

LOW-PASS

FILTER

VOLTAGE

FILTER

REFERENCE

MLC416

DAC

DIGITAL

SINE WAVE

SYNTHESIZER

Fig.4 Block diagram of the frequency generator and melody output (P1.7/MDY) section.

1997 Apr 16

8

Philips Semiconductors	Product specification
8-bit microcontrollers with DTMF generator,	PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM	PCD3755F

6.2Melody output (P1.7/MDY)

The melody output (P1.7/MDY) is very useful for generating musical tones 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 3). However, even higher frequency tones 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 being 2 for the P1.7/MDY output, rather than 60 for the TONE output - the value shown in equation (1). 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 with 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 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 24.

6.3Frequency 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 of the sine wave generated ‘f’ is dependent on the clock frequency ‘fxtal’ and the decimal value ‘x’ held in the frequency registers (HGF and LGF). The variables are related by the equation:

fxtal	where	60 £ x £ 255 (1)
f = ---------------------------------[23 (x + 2) ]

The frequency limitation given by x ³ 60 is due to the low-pass filters which would attenuate higher frequency sine waves.

1997 Apr 16

9

Philips Semiconductors Product specification

8-bit microcontrollers with DTMF generator,		PCD3755A; PCD3755E;
8 kbytes OTP and 128 bytes EEPROM		PCD3755F
6.4 DTMF frequencies	6.5	Modem frequencies

Assuming an oscillator frequency fxtal = 3.58 MHz, the DTMF standard frequencies can be implemented as

shown in Table 6.

The relationships between telephone keyboard symbols, DTMF frequency pairs and the frequency register contents are given in Table 7.

Table 6 DTMF standard frequencies and their implementation; value = LGF, HGF contents

VALUE	FREQUENCY (Hz)		DEVIATION
(HEX)	STANDARD	GENERATED	(%)	(Hz)
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 7 Dialling symbols, corresponding DTMF frequency pairs and frequency register contents

TELEPHONE	DTMF FREQ.	LGF	HGF
KEYBOARD	PAIRS	VALUE	VALUE
SYMBOLS	(Hz)	(HEX)	(HEX)
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

Again assuming an oscillator frequency fxtal = 3.58 MHz, the standard modem frequencies can be implemented as in Table 8. It is suggested to define the frequency by the HGF register while the LGF register contains 00H, disabling Low Group Frequency generation.

Table 8 Standard modem frequencies and their implementation

	HGF	FREQUENCY (Hz)		DEVIATION
	VALUE
		MODEM	GENERATED	(%)	(Hz)
	(HEX)
	9D	980(1)	978.82	−0.12	−1.18
	82	1180(1)	1179.03	−0.08	−0.97
	8F	1070(2)	1073.33	0.31	3.33
	79	1270(2)	1265.30	−0.37	−4.70
	80	1200(3)	1197.17	−0.24	−2.83
	45	2200(3)	2192.01	−0.36	−7.99
	76	1300(4)	1296.94	−0.24	−3.06
	48	2100(4)	2103.14	0.15	3.14
	5C	1650(1)	1655.66	0.34	5.66
	52	1850(1)	1852.77	0.15	2.77
	4B	2025(2)	2021.20	−0.19	−3.80
	44	2225(2)	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.

1997 Apr 16

10