M16C62P_06 Datasheet, PDF (97/421 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

M16C/62P Group (M16C/62P, M16C/62PT)
10. Clock Generation Circuit
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
Item
Use of Clock
Clock Generation Circuit Specifications
Main Clock
Oscillation Circuit
• CPU clock source
• Peripheral function
clock source
Sub Clock
Oscillation Circuit
• CPU clock source
• Timer A, B's clock
source
Clock Frequency
Usable Oscillator
Pins to Connect
Oscillator
Oscillation Stop,
Restart Function
Oscillator Status
After Reset
Other
0 to 16 MHz
• Ceramic oscillator
• Crystal oscillator
XIN, XOUT
32.768 kHz
• Crystal oscillator
XCIN, XCOUT
Presence
Presence
Oscillating
Stopped
Externally derived clock can be input
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
−
PLL frequency
synthesizer
• CPU clock source
• Peripheral function
clock source
10 to 24MHz
−
−
−
Presence
Presence
Stopped
Stopped
−
−
Rev.2.41 Jan 10, 2006 Page 82 of 390
REJ09B0185-0241