10. Clock Generation Circuit; Types Of The Clock Generation Circuit; Pll Frequency Synthesizer - Renesas M16C/62P Series Hardware Manual

M16C/62P Group (M16C/62P, M16C/62PT)

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
Use of Clock
Clock Frequency
Usable Oscillator
Pins to Connect
Oscillator
Oscillation Stop,
Restart Function
Oscillator Status
After Reset
Other
Rev.2.41 Jan 10, 2006
REJ09B0185-0241
http://www.xinpian.net
Main Clock
Oscillation Circuit Oscillation Circuit
• CPU clock source • CPU clock source
• Peripheral function • Timer A, B's clock
clock source source
0 to 16 MHz 32.768 kHz
• Ceramic oscillator • Crystal oscillator
• Crystal oscillator
XIN, XOUT XCIN, XCOUT
Presence Presence
Oscillating Stopped
Externally derived clock can be input
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Sub Clock
On-chip oscillator
• CPU clock source
• Peripheral function clock
source
• CPU and peripheral
function
clock sources when the
main clock stops
oscillating
About 1 MHz
−
−
Presence
Stopped
−
10. Clock Generation Circuit
PLL frequency
synthesizer
• CPU clock source
• Peripheral function
clock source
10 to 24MHz
−
−
Presence
Stopped
−
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