4513 datasheet(166/210 Pages) RENESAS

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APPLICATION

2-63

4513/4514 Group User’s Manual

2.10 Oscillation circuit

The 4513/4514 Group has an internal oscillation circuit to produce the clock required for microcomputer

operation.

The clock signal f(XIN) is obtained by connecting a ceramic resonator to XIN pin and XOUT pin.

2.10.1 Oscillation circuit

(1)

f(XIN) clock generating circuit

The clock signal f(XIN) is obtained by connecting a ceramic resonator externally.

Connect this external circuit to pins XIN and XOUT at the shortest distance. A feed-back resistor is

built-in between XIN pin and XOUT pin.

Figure 2.10.1 shows an example of an oscillation circuit connecting a ceramic resonator externally.

Keep the maximum value of oscillation frequency within the range listed Table 2.10.1.

Supply voltage

2.5 V to 5.5 V

4.0 V to 5.5 V

2.5 V to 5.5 V

2.0 V to 5.5 V (Note)

(System clock)

(f(XIN)/2) Middle-speed mode

(f(XIN))

High-speed mode

(f(XIN))

High-speed mode

(f(XIN)/2) Middle-speed mode

(f(XIN))

High-speed mode

Oscillation frequency

4.2 MHz

2.0 MHz

3.0 MHz

1.5 MHz

Note: 2.5 V to 5.5 V for the One Timer PROM version.

Table 2.10.1 Maximum value of oscillation frequency and supply voltage

Fig. 2.10.1 Oscillation circuit example connecting

ceramic resonator externally

Note: Externally connect a

damping resistor Rd de-

pending on the oscilla-

tion frequency. (A feed-

back resistor is built-in.)

Use

the

resonator

manufacturer’s recom-

mended value because

constants such as ca-

pacitance depend on the

resonator.

4513/4514

XIN

XOUT

CIN

COUT

4513 Datasheet(PDF) 166 Page - Renesas Technology Corp

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