7733 datasheet(366/940 Pages) RENESAS

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CLOCK GENERATING CIRCUIT

7733 Group User’s Manual

14–3

M37733MHBXXXFP

Externally generated clock

Open

XIN

XOUT

VCC

VSS

M37733MHBXXXFP

XIN

XOUT

CIN

COUT

14.2 Oscillation circuit example

Main-clock and sub-clock oscillation circuits’ examples are described below.

Fig. 14.2.1 Connection example of resonator/oscillator

Fig. 14.2.2 Externally generated clock input example

14.2.1 Main-clock oscillation circuit example

To the main-clock oscillation circuit, a resonator/

oscillator can be connected, or a clock which is

externally generated can be input.

(1) Connection example of resonator/oscillator

Figure 14.2.1 shows an example where pins

XIN and XOUT connect across a ceramic

resonator/quartz-crystal oscillator.

Circuit constants such as Rf, Rd, CIN, and COUT

(shown in Figure 14.2.1) depend on the

resonator/oscillator. These values shall be set

to the resonator/oscillator manufacturer’s

recommended values.

(2) Input example of clock which is externally

generated

Figure 14.2.2 shows an input example of a clock

which is externally generated.

When inputting a main clock from an external

circuit, set “1” to bit 1 of the main-clock oscillation

circuit control register 1. (Refer to Figure 14.3.3.)

By this setting, the main-clock oscillation circuit

stops operating and power consumption can

be held down. Note that this bit has a function

to select return conditions from the stop mode.

(Refer to chapter “11. STOP AND WAIT

MODES.”) Furthermore, when writing to the

oscillation circuit control register 1, follow the

procedure shown in Figure 14.3.4.

When inputting a main clock from an external

circuit, that the external clock must be input

from pin XIN, and pin XOUT must be left open.

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