PCD6001 Просмотр технического описания (PDF) - Philips Electronics
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PCD6001 Datasheet PDF : 96 Pages
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Philips Semiconductors
Digital telephone answering machine chip
Product specification
PCD6001
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
7
6
5
input clock 1 input clock 0 PLL off/on
4
VMIC off/on
3
2
CODEC2; analog
D/A
(loudspeaker)
off/on
A/D
(microphone)
off/on
1
0
CODEC1; analog
D/A
(to_line)
off/on
A/D
(from_line)
off/on
9.2.3 SYSTEM POWER AND CLOCK CONFIGURATION REGISTER (SPCON)
Table 4 System Power and Clock Configuration Register (SFR address 99H); reset state 00H
7
system off
6
spare
5
spare
4
DSP on
3
2
CODEC2; digital
D/A
(loudspeaker)
off/on
A/D
(microphone)
off/on
1
0
CODEC1; digital
D/A
(to_line)
off/on
A/D
(from_line)
off/on
9.2.4 CLOCK CONTROL REGISTER (CKCON)
Table 5 Clock Control Register (SFR address 9AH); reset state 00H
7
6
5
4
3
2
1
0
EMG mode RTC mode DSP clock 1 DSP clock 0 micro clock 1 micro clock 0 FS_event 1 FS_event 0
2001 Apr 17
16
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