參數(shù)資料
型號(hào)： PCD6001U
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： Digital telephone answering machine chip
中文描述： SPECIALTY TELECOM CIRCUIT, UUC
文件頁(yè)數(shù)： 12/96頁(yè)
文件大?。?/td> 385K
代理商： PCD6001U
2001 Apr 17
12
Philips Semiconductors
Product specification
Digital telephone answering machine chip
PCD6001
9
TICB - GENERATION AND SELECTION OF
SYSTEM CLOCKS
The TICB generates the clocks for all digital chip blocks,
and controls the on/off switching of these blocks by using
clock gating. The TICB is controlled via the microcontroller
SFR registers SYMOD, CKCON and SPCON. The TICB
contains:
An input section to adapt to different input clock rates
A clock generation section
A clock selection section
The Real-Time Clock for a 1 minute interrupt generation
The microcontroller interrupt timers (FS_event and
TIME_event) and the DSP interrupt timer (FS1) to
respectively synchronize the microcontroller and DSP
processes.
9.1
Microprocessor, DSP, CODEC and IOM clock
generation
Figure 4 shows the TICB input section and the clock
generation section.
The clock generation section contains a PLL to generate
the clock rates which are higher then the input clock rate.
With the input section, a wider variety of input clock
frequencies can be adapted to the input frequency values
needed by the PLL (3.456 or 3.580 MHz).
In order to save power the PLL can be switched off. This
should however only be done when the chip is in the
Emergency mode. When switching on the PLL, it takes
40
μ
s (173 emergency clock periods) until the clock
frequencies are derived from the PLL output.
Table 2 gives a description of the signals and their values
for a crystal frequency of 3.456 and 3.580 MHz.
The clock generation section also contains logic to
synchronize the CODEC timing signals and the DSP and
microcontroller interrupt timers to an external Frame
Sync. (FSC). This synchronization is only activated when
using the IOM in Slave mode. If the IOM is activated in
Master mode, the TICB generates the DCK and
FSC signals from CLK28.
Some of the clock signals can be made available as
general purpose clock, for various peripherals needing a
clock source such as an PCA1070 line interface. This
general purpose clock (GPC) signal is an alternative
output of P4.5 and can be turned on with ALTP bit 3. With
ALTP bit 2, the source for GPC can be defined. The GPC
source is EMG_CLK (normally 3.58 MHz) when bit 2 is
logic 0 and the GPC source is
μ
C_CLK when bit 2 is set to
logic 1. As a spike-free GPC is not guaranteed when
switching between these clocks, it is recommended to first
set the clock source before switching on the GPC. The
ALTP register is described in more detail in Section 16.2.
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