M16C1N Datasheet, PDF (35/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
6. Clock Generation Circuit
6. Clock Generation Circuit
The clock regeneration circuit contains three circuits as follows:
- Main clock oscillation circuit
- Sub clock oscillation circuit
- On-chip oscillator
Table 6.1 lists Clock Generation Circuit Specifications. Figure 6.1 shows a Clock Generation Circuit. Figure
6.2, 6.3 and 6.5 show clock-associated registers. Figure 6.4 shows fC32 block diagram.
Table 6.1 Main clock, sub-clock, and on-chip oscillator circuits
Main clock oscillation circuit Sub clock oscillation circuit On-chip oscillator circuit
Use of clock
• CPU’s operating clock source • CPU’s operating clock source • CPU’s operating clock source
• Internal peripheral unit’s • Timer 1/X/Y/Z’s count • Internal peripheral unit’s
operating clock source clock source
operating clock source
• Timer Y’s count clock
source
Usable oscillator
• Ceramic oscillator
• Crystal oscillator
–
connectable (Note 1) • Crystal oscillator
Oscillator connect pins XIN, XOUT
XCIN, XCOUT
None (has internal pins)
Oscillation stop/restart function Available
Available
Available
Oscillator status immediately Oscillating
Stopped
Oscillating
after reset
Other
Externally generated clock can be input
–
Note 1: When not using the main clock generating circuit, pull up the XIN pin and leave the XOUT pin open.
Also, set the main clock stop bit (bit 5 at address 000616) to "1" (stop).
Rev.1.00 Oct 20, 2004 page 23 of 222
REJ09B0007-0100Z