M16C6NK Datasheet, PDF (74/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

Under development
This document is under development and its contents are subject to change.
M16C/6N Group (M16C/6NK, M16C/6NM)
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 ⁽¹⁾
Usable
•Ceramic oscillator •Crystal oscillator -
-
Oscillator
•Crystal oscillator
Pins to Connect XIN, XOUT
Oscillator
Oscillation Stop Available
and Re-Oscillation
Detection Function
Oscillation Status Oscillating
After Reset
XCIN, XCOUT
Available
Stopped
-
Available
Stopped
-
Available
Stopped
Other
Externally derived clock can be input
-
-
NOTE:
1. 24 MHs is available Normal-ver. only.
Rev.2.00 Nov 28, 2005 page 56 of 378
REJ09B0124-0200