PCD6001 datasheet(18/96 Pages) PHILIPS

18 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6001

Table 8 shows the DSP clock frequency settings. Setting

the DSP frequency to the correct value according to the

operation mode of the DSP is done by the Application

Programming Interface (API). Please refer to the API

specification for more details.

Table 9 shows CLK_3 selection (CKCON.6/CKCON.7

according to Fig.4). The selection depends on the type of

crystal which is connected (determined by RTC mode

setting according to Table 6). The setting of CKCON [6:7],

thus determines the selection of the CLK_3 source (see

Table 2 and Fig.4). If CKCON.7 = 0 to denote Emergency

mode - CLK_3 will be derived from the EMG_CLK, as

shown in the following tables.

The TICB provides two periodic outputs to the

microcontroller: FS_event and TIME_event. FS_event is

programmable to 4 different rates. Both outputs are

derived from and therefore synchronized to FS1. The

outputs are connected to an interrupt input of the

microcontroller and called ‘Time_event interrupt’ and

‘FS_event interrupt’ respectively. The selection of the

FS_event interrupt rate is done via the CKCON SFR, see

Section 9.2.4. Figure 8 shows the generation of these

interrupts. Table 10 shows the selection of the FS_event

rate. The FS1 clock is provided by the CDCCNTRL block

shown in Fig.4.

Table 8

DSP clock selection

Table 9

CODEC clock selection

Note

1. A phase corrected CLK_3 clock is not available in Emergency mode (CKCON.7 = 0). For a CLK_3 phase correction

(CKCON.6 = 1), CLK_21 must be available.

Table 10 FS_event rate selection

CKCON.7

(EMG mode)

CKCON.5

(DSP clock 1)

CKCON.4

(DSP clock 0)

SYMOD.5

(PLL on/off)

DSP CLOCK

FREQUENCY

EMG_CLK

no clock active

1001

CLK_1

1011

CLK_7

1101

CLK_42

1111

CLK_28

CKCON.7

(EMG mode)

CKCON.6

(RTC mode)

CLK_3 SOURCE

EMG_CLK(1)

CLK3_CORR

CLK3_OUT

CKCON.1

(FS_event 1)

CKCON.0

(FS_event 0)

FS_event INTERRUPT RATE

FS1/16

500 Hz

2 ms

FS1/8

1 kHz

1 ms

FS1/4

2 kHz

500

µs

FS1

8 kHz

125

µs

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