M16C30P_07 Datasheet, PDF (61/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
9. Clock Generating Circuit
9. Clock Generating Circuit
9.1 Types of the Clock Generating Circuit
Two circuits are incorporated to generate the system clock signal :
• Main clock oscillation circuit
• Sub clock oscillation circuit
Table 9.1 lists the Clock Generation Circuit Specifications. Figure 9.1 shows the clock generation circuit.
Figures 9.2 to 9.4 show the clock-related registers.
Table 9.1 Clock Generation Circuit Specifications
Item
Main Clock Oscillation Circuit
Sub Clock Oscillation Circuit
Use of Clock
• CPU clock source
• CPU clock source
• Peripheral function clock source • Timer A, B's clock source
Clock Frequency
0 to 16 MHz
32.768 kHz
Usable Oscillator
• Ceramic oscillator
• Crystal oscillator
• Crystal oscillator
Pins to Connect Oscillator XIN, XOUT
XCIN, XCOUT
Oscillation Stop,
Restart Function
Presence
Presence
Oscillator Status
After Reset
Oscillating
Stopped
Other
Externally derived clock can be input
Rev.1.22 Mar 29, 2007 Page 45 of 291
REJ09B0179-0122