Table of Contents
Advertisement
M16C/62P Group (M16C/62P, M16C/62PT)
10. Clock Generating Circuit
10.1 Types of the Clock Generating Circuit
Four 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
Oscillation Circuit
• CPU clock source
Use of Clock
• Peripheral function
clock source
Clock Frequency
0 to 16 MHz
• Ceramic oscillator
Usable Oscillator
• Crystal oscillator
XIN, XOUT
Pins to Connect
Oscillator
Presence
Oscillation Stop,
Restart Function
Oscillating
Oscillator Status
After Reset
Externally derived clock can be input
Other
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
Main Clock
Sub Clock
Oscillation Circuit
•CPU clock source
• Clock source of
Timer A, B
32.768 kHz
• Crystal oscillator
XCIN, XCOUT
Presence
Stopped
page 65
f o
3
6
4
10. Clock Generating Circuit
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
PLL Frequency
Synthesizer
• CPU clock source
• Peripheral function clock
source
10 to 24 MHz
Presence
Stopped
Advertisement
Table of Contents
