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S3F84B8_UM_REV 1.00
Internal RC
Oscillator (8MHz)
Internal RC
Oscillator (0.5 MHz)
External
Crystal/Ceramic
Oscillator
External RC
Oscillator
An external interrupt (with RC-delay noise filter ) can be used to release stop mode
NOTE:
and "wake-up" the main oscillator .
In the S3F84B8, the INT0-INT5 external interrupts are of this type .
Smart Option
(3F.1-0 in ROM)
Oscillator
Stop
MUX
Oscillator
Wake-up
CLKCON.7
Figure 7-4
Stop
Instruction
1/2
Selected
OSC
1/8
1/16
Noise
Filter
INT Pin
System Clock Circuit Diagram
7-3
7 CLOCK CIRCUIT
CLKCON.4-.3
M
U
X
CPU Clock
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