PCD6003 datasheet(75/96 Pages) PHILIPS

75 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6003

16.2.3

PORT 4REGISTER (P4)

The alternative outputs (GPC, FSO, FSK and LE) are connected with the general purpose outputs via an AND gate.

Therefore, when using the alternative functions the corresponding port bits should be set to a logic 1.

Table 73 Port 4 Register (SFR address 98H); bit addressable; reset state 1EHH; note 1

16.2.4

PORT 4CONFIGURATION REGISTER (P4CFG)

This register is used to select the output configuration of the pins WR, RD and P4.0 to P4.4. The output configuration is

open-drain by default after reset. Note that the output configuration of P4.5 is selected by the P4.5 bit in SFR ALTP.

Table 74 Port 4 Conﬁguration Register (SFR address 9FH); reset state 00H

Table 75 Description of P4CFG bits

16.2.5

ALTERNATIVE PORT FUNCTION REGISTER (ALTP)

This register selects the pin configuration for the MSK, IOM master/slave and general purpose function; see Table 77.

The general purpose clock function is described in Section 9.1. The LE functionality is described in Section 10.13.

Table 76 Alternative Port Function Register (SFR address ABH); reset state 00H

Table 77 P3.7, P3.6, P3.1 and P3.0 selection of pin conﬁgurations for alternative function

76543210

−−

P4.5/GPC

P4.4/FSI

P4.3

P4.2/FSO

P4.1/FSK

P4.0/LE

76543210

EAM

P4.4

P4.3

P4.2

P4.1

P4.0

BIT

SYMBOL

DESCRIPTION

If WR = 0, then open-drain conﬁguration. If WR = 1, then push-pull conﬁguration.

If RD = 0, then open-drain conﬁguration. If RD = 1, then push-pull conﬁguration.

EAM

The EAM bit is used to select the Enhanced Addressing Mode; this is described in more

detail in Chapter 12.

P4.4

If P4.4 = 0, then open-drain conﬁguration. If P4.4 = 1, then push-pull conﬁguration.

P4.3

If P4.3 = 0, then open-drain conﬁguration. If P4.3 = 1, then push-pull conﬁguration.

P4.2

If P4.2 = 0, then open-drain conﬁguration. If P4.2 = 1, then push-pull conﬁguration.

P4.1

If P4.1 = 0, then open-drain conﬁguration. If P4.1 = 1, then push-pull conﬁguration.

P4.0

If P4.0 = 0, then open-drain conﬁguration. If P4.0 = 1, then push-pull conﬁguration.

76543210

−

IOM on P3

IOM master/

MSK

P4.5

GPC off/on

GPC source

LE off/on

early LE

ALTP.6

ALTP.5

MODE

general purpose I/O port

MSK

IOM slave

IOM master

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