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M16C/6N Group (M16C/6NK, M16C/6NM)
8. Clock Generating Circuit
8.1 Types of 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 8.1 lists the clock generating circuit specifications. Figure 8.1 shows the clock generating circuit.
Figures 8.2 to 8.8 show the clock-related registers.
Table 8.1 Clock Generating Circuit Specifications
Item
Oscillation Circuit
Use of Clock
• CPU clock source
• Peripheral function
clock source
Clock
0 to 16 MHz
Frequency
Usable
•Ceramic oscillator
Oscillator
•Crystal oscillator
Pins to Connect
XIN, XOUT
Oscillator
Oscillation Stop
Available
and Re-Oscillation
Detection Function
Oscillating
Oscillation Status
After Reset
Other
Externally derived clock can be input
NOTE:
1. 24 MHs is available Normal-ver. only.
Rev.2.00
Nov 28, 2005
REJ09B0124-0200
Main Clock
Sub Clock
Oscillation Circuit
• CPU clock source
• Clock source of Timer
A, B
32.768 kHz
•Crystal oscillator
XCIN, XCOUT
Available
Stopped
page 56 of 378
8. Clock Generating Circuit
On-chip Oscillator
• CPU clock source
• CPU clock source
• Peripheral function
• Peripheral function
clock source
clock source
• CPU and peripheral
function clock sources
when the main clock
stops oscillating
16 MHz, 20 MHz,
About 1 MHz
24 MHz
-
-
-
-
Available
Available
Stopped
Stopped
-
-
PLL Frequency
Synthesizer
(1)
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