Samsung S3P80C5 User Manual page 198

S3P80C5/C80C5/C80C8
7
CLOCK CIRCUITS
OVERVIEW
The clock frequency generated for the S3P80C5/C80C5/C80C8 by an external crystal, or supplied by an external
clock source, can range from 1MHz to 4 MHz. The maximum CPU clock frequency, as determined by CLKCON
register settings, is 4 MHz. The X
clock circuit.
SYSTEM CLOCK CIRCUIT
The system clock circuit has the following components:
— External crystal or ceramic resonator oscillation source (or an external clock)
— Oscillator stop and wake-up functions
— Programmable frequency divider for the CPU clock (f
— Clock circuit control register, CLKCON
C1
C2
Figure 7-1. Main Oscillator Circuit
(External Crystal or Ceramic Resonator)
and X pins connect the external oscillator or clock source to the on-chip
IN OUT
X
IN
X
OUT
divided by 1, 2, 8, or 16)
OSC
External
Clock
Open Pin
Figure 7-2. External Clock Circuit
CLOCK CIRCUITS
X
IN
X
OUT
7-1