PCD6001 datasheet(17/96 Pages) PHILIPS

17 / 96 page

2001 Apr 17

Philips Semiconductors

Product speciﬁcation

Digital telephone answering machine chip

PCD6001

Table 6 shows the input clock selection in the analog

section of the chip. Note that for 3.456 and 3.58 MHz

crystal input clock, no clock division is done prior to

inputting it to the PLL. After reset the input clock division

rate is by default 1. This means that applications using an

input clock frequency other than 3.456 or 3.580 MHz, will

have to set the proper division rate, after system start-up.

Otherwise proper functionality of the analog blocks is not

guaranteed.

Table 7 shows the microcontroller clock frequencies. In

Emergency mode (bit 7 of CKCON reset), the EMG_CLK

is input directly to the microcontroller. The values of

CKCON bits 2 and 3 are then irrelevant. Note that

Emergency mode operation is only designed for start-up

and POTS mode condition. Peripheral blocks (such as the

CODECs and the IOM block) are not guaranteed to work

when CKCON bit 7 is reset.

Table 6

Input clock selection

Note

1. The PCD6001 timing system is based on the 3.456 MHz (or multiples) input clock frequency. In order to be able to

use the low cost 3.58 MHz crystal or ceramic resonator, a clock frequency correction is needed for some blocks

(RTC, CODEC and IOM). IOM will only operate in Master mode.

Table 7

Microcontroller clock selection

Notes

1. 6 clocks/cycle.

2. If the PLL is switched off when not in Emergency mode, the selected clock would not be available. The micro would

hang up. Before CKCON.7 is set to logic 1, SYMOD.5 must be set to logic 1 to activate the PLL.

CKCON.6

(RTC MODE)

SYMOD.7

(input clock 1)

SYMOD.6

(input clock 0)

INPUT CLOCK

DIVISION RATIO

CHIP INPUT CLOCK

FREQUENCY (MHz)

0001

3.456

1001

3.580(1)

0012

6.912

0104

13.824

CKCON.7

(EMG mode)

CKCON.3

(micro clock 1)

CKCON.2

(micro clock 0)

SYMOD.5

PLL on/off

MICROCONTROLLER

CLOCK FREQUENCY(1)

EMG_CLK

do not use(2)

1001

CLK_1

1011

CLK_7

1101

CLK_14

1111

CLK_21

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