PCD3349 datasheet(9/20 Pages) PHILIPS

9 / 20 page

1998 May 11

Philips Semiconductors

Product speciﬁcation

8-bit microcontroller with DTMF generator

PCD3349A

TIMING

Although the PCD3349A operates over a clock frequency

range from 1 to 16 MHz, fxtal = 3.58 MHz will usually be

chosen to take full advantage of the frequency generator

section.

RESET

In addition to the conditions given in the

“PCD33xxA

Family” data sheet, all derivative registers are cleared in

the RESET state.

STOP MODE

Since the oscillator is switched off, the frequency

generator receives no clock. It is suggested to clear both

the HGF and LGF registers before entering Stop mode.

This will cut-off the biasing of the internal amplifiers,

considerably reducing current requirements.

10 IDLE MODE

In the Idle mode, the frequency generator remains

operative.

11 INSTRUCTION SET RESTRICTIONS

Since no serial I/O interface is provided, the serial I/O

(Input/Output) instructions are not available. ‘MOV Dx, A’

is the only applicable derivative instruction because the

derivative registers are write-only.

ROM space being restricted to 4 kbytes, SEL MB2/3 would

define non-existing Program Memory banks and should

therefore be avoided.

RAM space being restricted to 224 bytes, care should be

taken to avoid accesses to non-existing RAM locations.

12 SUMMARY OF MASK OPTIONS

Table 7

Port mask options

Notes

1. Port output drives:

a) Option 1: standard I/O.

b) Option 2: open-drain I/O.

c) Option 3: push-pull output; see

“PCD33xxA Family” data sheet.

2. Port state after reset: S = Set (HIGH) and R = Reset (LOW).

Table 8

Mask options

PORT NAME

PORT OUTPUT DRIVE(1)

PORT STATE AFTER RESET(2)

OPTION 1

OPTION 2

OPTION 3

SET

RESET

Port 0 (P0.0 to P0.7)

Port 1 (P1.0 to P1.7)

Port 2 (P2.0 to P2.7)

FEATURE

DESCRIPTION

ROM code: program/data

Any mix of instructions and data up to ROM size of 4 kbytes.

Power-on-reset voltage level: VPOR

1.2 to 3.6 V in increments of 100 mV; OFF

Oscillator transconductance: gm

LOW transconductance: gmL

MEDIUM transconductance: gmM

HIGH transconductance: gmH

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