M16C29 Datasheet, PDF (71/499 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/Tiny SERIES

M16C/29 Group
7. Clock Generation Circuit
7. Clock Generation Circuit
The clock generation circuit contains four oscillator circuits as follows:
(1) Main clock oscillation circuit
(2) Sub clock oscillation circuit
(3) Variable on-chip oscillators
(4) PLL frequency synthesizer
Table 7.1 lists the specifications of the clock generation circuit. Figure 7.1 shows the clock generation
circuit. Figures 7.2 to 7.7 show clock-associated registers.
Table 7.1 Clock Generation Circuit Specifications
Item
Use of clock
Clock frequency
Usable oscillator
Main Clock
Sub Clock
Oscillation Circuti Oscillation Circuit
Variable On-chip Oscillator
PLL Frequency
Synthesizer
- CPU clock source - CPU clock source - CPU clock source
- CPU clock source
- Peripheral function - Timer A, B's clock - Peripheral function clock source - Peripheral function clock
clock source
source
- CPU and peripheral function
source
clock sources when the main
clock stops oscillating
0 to 20 MHz
32.768 kHz
Selectable source frequency:
f1(ROC), f2(ROC), f3(ROC)
Selectable divider:
by 2, by 4, by 8
10 to 20 MHz
- Ceramic oscillator - Crystal oscillator
- Crystal oscillator
Pins to connect XIN, XOUT
oscillator
XCIN, XCOUT
Oscillation stop,
restart function
Oscillator status
after reset
Other
Available
Available
Oscillating
Stopped
Externally derived clock can be input
Available
Oscillating
(CPU clock source)
Available
Stopped
Rev. 1.12 Mar.30, 2007
REJ09B0101-0112
page 47 of 458