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S3C9442/C9444/F9444/C9452/C9454/F9454
Internal RC
oscillator (3.2 MHz)
Internal RC
oscillator (0.5 MHz)
External crystal/
ceramic oscillator
External RC
oscillator
NOTE:
Smart option
(3F.1-0 in ROM)
Oscillator
MUX
Oscillator
Wake-up
CLKCON.7
An external interrupt (with RC-delay noise filter) can be used to release stop mode
and "wake-up" the main oscillator.
In the S3C9442/C9444/C9452/C9454, the INT0-INT1 external interrupts are of this type.
Figure 7-4. System Clock Circuit Diagram
Stop
Instruction
Stop
Selected
OSC
Noise
Filter
INT Pin
CLKCON.4-.3
1/2
M
U
1/8
X
1/16
P2CONH.6-.4
CLOCK CIRCUIT
CPU Clock
P2.6/CLO
7-3
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