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M16C6NL Datasheet, PDF (67/388 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES | |||
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Under development
This document is under development and its contents are subject to change.
M16C/6N Group (M16C/6NL, M16C/6NN)
8. Clock Generating Circuit
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
Main Clock
Oscillation Circuit
Sub Clock
Oscillation Circuit
On-chip Oscillator
PLL Frequency
Synthesizer
Use of Clock
⢠CPU clock source ⢠CPU clock source ⢠CPU clock source ⢠CPU clock source
⢠Peripheral function
⢠Clock source of Timer
⢠Peripheral function
clock source
⢠Peripheral function
clock source
A, B
⢠CPU and peripheral clock source
function clock sources
when the main clock
stops oscillating
Clock
0 to 16 MHz
32.768 kHz
About 1 MHz
16 MHz, 20 MHz,
Frequency
24 MHz
Usable
â¢Ceramic oscillator â¢Crystal oscillator -
-
Oscillator
â¢Crystal oscillator
Pins to Connect XIN, XOUT
XCIN, XCOUT
-
-
Oscillator
Oscillation Stop Available
and Re-Oscillation
Detection Function
Oscillation Status Oscillating
After Reset
Available
Stopped
Available
Stopped
Available
Stopped
Other
Externally derived clock can be input
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Rev.2.00 Nov 28, 2005 page 51 of 364
REJ09B0126-0200
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