7733 datasheet(367/940 Pages) RENESAS

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CLOCK GENERATING CIRCUIT

7733 Group User’s Manual

14–4

M37733MHBXXXFP

Externally generated clock

XCIN

P76/AN6

VCC

VSS

External circuit

M37733MHBXXXFP

XCIN

XCOUT

RCf

CCIN

CCOUT

RCd

14.2 Oscillation circuit example

Fig. 14.2.3 Connection example of quartz-crystal oscillator

Fig. 14.2.4 Externally generated clock input example

14.2.2 Sub-clock oscillation circuit example

To the Sub-clock oscillation circuit, an oscillator can

be connected, or a clock which is externally generated

can be input.

(1) Connection example of oscillator

When using an oscillator, connect a quartz-

crystal oscillator between pins XCIN and XCOUT.

(A ceramic resonator cannot be connected.)

Figure 14.2.3 shows a quartz-crystal oscillator

connection example.

Circuit constants such as Rcf, Rcd, CCIN, and

CCOUT (shown in Figure 14.2.3) depend on the

oscillator. These values shall be set to the

oscillator manufacturer’s recommended values.

When connecting an oscillator to the sub-clock

oscillation circuit, set the port-Xc selection bit

(bit 4 at address 6C16) to “1” and the sub clock

external input selection bit (bit 2 at address

6F16) to “0.” Note that the sub clock external

input selection bit has a function to select return

conditions from the stop mode. (Refer to chapter

“11. STOP AND WAIT MODES.”)

(2) Input example of clock which is externally

generated

Figure 14.2.4 shows an input example of a clock

which is generated in an external circuit.

When inputting a sub clock from an external

circuit, be sure to set the sub clock external

input selection bit to “1,” and then, select pins

XCIN and XCOUT by the port-Xc selection bit.

In this case, an externally generated clock is

input to pin XIN, and pin XOUT functions as pin

P76/AN6. Note that the sub clock external input

selection bit has a function to select return

conditions from the stop mode. (Refer to chapter

“11. STOP AND WAIT MODES.”)

If the sub-clock output selection bit (bit 1 at

address 6D16) is set to “1” when the port-Xc

selection bit = “1” (Note), sub clock

φSUB is

output from port P67. Accordingly, a 32-kHz

sub clock can be supplied to external gates.

Note: At this time, a sub clock is used.

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