M16CSLASH1N datasheet(35/238 Pages) RENESAS

35 / 238 page

Rev.1.00

Oct 20, 2004

page 23 of 222

M16C/1N Group

6. Clock Generation Circuit

REJ09B0007-0100Z

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

Oscillator status immediately Oscillating

Stopped

Oscillating

after reset

Other

Externally generated clock can be input

–

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

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).

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