M16C/62P Group (M16C/62P, M16C/62PT)
10. Clock Generation Circuit
Rev.2.41
Jan 10, 2006
Page 82 of 390
REJ09B0185-0241
10. Clock Generation Circuit
10.1
Types of the Clock Generation Circuit
4 circuits are incorporated to generate the system clock signal :
•
Main clock oscillation circuit
•
Sub clock oscillation circuit
•
On-chip oscillator
•
PLL frequency synthesizer
Table 10.1 lists the Clock Generation Circuit Specifications. Figure 10.1 shows the Clock Generation Circuit.
Figures 10.2 to 10.6 show the clock-related registers.
Table 10.1
Clock Generation Circuit Specifications
Item
Main Clock
Oscillation Circuit
Sub Clock
Oscillation Circuit
On-chip oscillator
PLL frequency
synthesizer
Use of Clock
• CPU clock source
• Peripheral function
clock source
• CPU clock source
• Timer A, B's clock
source
• CPU clock source
• Peripheral function clock
source
• CPU and peripheral
function
clock sources when the
main clock stops
oscillating
• CPU clock source
• Peripheral function
clock source
Clock Frequency
0 to 16 MHz
32.768 kHz
About 1 MHz
10 to 24MHz
Usable Oscillator
• Ceramic oscillator
• Crystal oscillator
• Crystal oscillator
−
−
Pins to Connect
Oscillator
XIN, XOUT
XCIN, XCOUT
−
−
Oscillation Stop,
Restart Function
Presence
Presence
Presence
Presence
Oscillator Status
After Reset
Oscillating
Stopped
Stopped
Stopped
Other
Externally derived clock can be input
−
−
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