Samsung P8245 Manuel D’Utilisation
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S3C8245/P8245/C8249/P8249
CLOCK CIRCUIT
7-1
7
CLOCK CIRCUIT
OVERVIEW
The clock frequency generated for the S3C8245/C8249 by an external crystal can range from 1 MHz to 10 MHz. The
maximum CPU clock frequency is 10 MHz. The X
maximum CPU clock frequency is 10 MHz. The X
IN
and X
OUT
pins connect the external oscillator or clock source to
the on-chip clock circuit.
SYSTEM CLOCK CIRCUIT
The system clock circuit has the following components:
— External crystal or ceramic resonator oscillation source (or an external clock source)
— Oscillator stop and wake-up functions
— Programmable frequency divider for the CPU clock (fxx divided by 1, 2, 8, or 16)
— System clock control register, CLKCON
— Oscillator control register, OSCCON and STOP control register, STPCON
X
IN
X
OUT
C1
C2
S3C8245/C8249
Figure 7-1. Main Oscillator Circuit
(Crystal or Ceramic Oscillator)
X
IN
X
OUT
S3C8245/C8249
Figure 7-2. Main Oscillator Circuit
(RC Oscillator)