PCD6003 datasheet(16/96 Pages) PHILIPS

16 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6003

9.2.1

SELECTION OF SYSTEM CLOCKS

Selection of system clocks involves:

• Selection of the crystal input clock in conjunction with

PLL on/off selection (SYMOD register)

• Selection of clocks for the DSP, microcontroller and

CODEC, together with microcontroller timing interrupt

rates (CKCON register)

• Activation, deactivation of individual clocks or

deactivation of the whole TICB in order to get an

optimum power consumption (SPCON register).

SYMOD, SPCON and CKCON are SFR registers in the

digital section which can be directly accessed by the

microcontroller. Sections 9.2.2 to 9.2.4 summarize the

control registers and settings used for system clock

selection.

The activation of the DSP, and the digital part of both

CODECs is controlled via the SPCON SFR.

The clock rates of the DSP and microcontroller, and the

microcontroller timing interrupt rates are set via the

CKCON SFR.

9.2.2

ANALOG SYSTEM MODE REGISTER (SYMOD)

Table 3

Analog System Mode Register (SFR address C5H); reset state 00H

9.2.3

SYSTEM POWER AND CLOCK CONFIGURATION REGISTER (SPCON)

Table 4

System Power and Clock Conﬁguration Register (SFR address 99H); reset state 00H

9.2.4

CLOCK CONTROL REGISTER (CKCON)

Table 5

Clock Control Register (SFR address 9AH); reset state 00H

input clock 1 input clock 0 PLL off/on

VMIC off/on

CODEC2; analog

CODEC1; analog

D/A

(loudspeaker)

off/on

A/D

(microphone)

off/on

D/A

(to_line)

off/on

A/D

(from_line)

off/on

system off

spare

DSP on

CODEC2; digital

CODEC1; digital

D/A

(loudspeaker)

off/on

A/D

(microphone)

off/on

D/A

(to_line)

off/on

A/D

(from_line)

off/on

5432

EMG mode

RTC mode

DSP clock 1

DSP clock 0

micro clock 1

micro clock 0

FS_event 1

FS_event 0

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