M16CSLASH29 datasheet(71/499 Pages) RENESAS

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7. Clock Generation Circuit

page 47

- CPU clock source

- Peripheral function

clock source

Use of clock

Main Clock

Oscillation Circuit

Sub Clock

Oscillation Circuit

Item

- CPU clock source

- Timer A, B's clock

source

Clock frequency

0 to 20 MHz

32.768 kHz

- Ceramic oscillator

- Crystal oscillator

Usable oscillator

- Crystal oscillator

XIN, XOUT

Pins to connect

oscillator

XCIN, XCOUT

Available

Oscillation stop,

restart function

Oscillating

Oscillator status

after reset

Stopped

Externally derived clock can be input

Other

PLL Frequency

Synthesizer

10 to 20 MHz

Stopped

Variable On-chip Oscillator

- CPU clock source

- Peripheral function clock source

- CPU and peripheral function

clock sources when the main

clock stops oscillating

Selectable source frequency:

f1(ROC), f2(ROC), f3(ROC)

Selectable divider:

by 2, by 4, by 8

Oscillating

- CPU clock source

- Peripheral function clock

source

(CPU clock source)

Available

7. Clock Generation Circuit

The clock generation circuit contains four oscillator circuits as follows:

(1) Main clock oscillation circuit

(2) Sub clock oscillation circuit

(3) Variable on-chip oscillators

(4) PLL frequency synthesizer

Table 7.1

lists the specifications of the clock generation circuit. Figure 7.1 shows the clock generation

circuit. Figures 7.2 to 7.7 show clock-associated registers.

Table 7.1 Clock Generation Circuit Specifications

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