peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 166

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Semiconductor Group
2.12.2
2.12.2.1
• CLK16: 16.384 MHz VCXO clock voltage oscillator
• CLK61: 61.44 MHz ext. oscillator clock
• CLK40-XI: up to 40 MHz ext quartz clock
• CLK40-XO: up to 40 MHz ext quartz clock
• CLK30: 30.72 MHz (i.e. for µP)
• CLK15: 15.36 MHz (i.e. for OCTAT-P)
• CLK7: 7.68 MHz (i.e. for QUAT-S)
• PFS: Frame synchronization on PCM 8 kHz
• PDC2: PCM data clock 2.048 MHz
• PDC4: PCM data clock 4.096 MHz
• PDC8: PCM data clock 8.192 MHz (i.e. for FALC54)
• FSC: Frame synchronization on IOM-2 interface 8 kHz
• DCL: IOM-2 data clock
• XCLK: 8 kHz or 512 kHz or 1.536 MHz or 2.048 MHz (selectable) input
• REFCLK (i.e. 512 kHz)
2.12.2.2
• DSP clock: Selectable clock ~ 20, 30 or 40 MHz
• RTCLK: Real time clock
• Programmable UART clock
• PFS: Frame synchronization on PCM 8 kHz
– The DSP clock can be selected from 3 possible frequencies: 20, 30 or 40 MHz.
– The source of the clock can be one of two:
– DSP clock frequency is determined by the input pins, FREQ1…0. The value of
– Clock for Real Time Interrupt: 1 Hz (1 s) or 100 Hz (10 ms)
– The RTC interrupt is a periodic interrupt activated every 10 ms/1 s and it is
– The UART clock is CLK61 divided by 5. It can be further divided by programming
– The PFS signal can be derived from either the CLK16 input clock or be driven by
61.44 MHz external oscillator, which by dividing by 2,3 produces the 20, 30 MHz
clock 40 MHz crystal with an internal oscillator which produces the 40 MHz clock.
these pins can be read from CCSEL0 register, bits1…0 (read only bits).
programmable via CCSEL1:RTCP.
the UART. (For more details see Table 2-34 in section 2.14.1.2)
an external signal via the IO pads. The selection between external and internal
signals is performed by CCSEL0:MS (master/slave bit). See Figure 2-46.
Types of Clock Signals
Input/Output Clocks
Clock Selection
2-120
Functional Block Description
input
output
output
output
output
input/output
input/output
input/output
input/output
input/output
input
input
input/output
input/output
input/output
internal clock
internal clock
internal clock
PEB 20560
2003-08