4513 datasheet(167/210 Pages) RENESAS

167 / 210 page

APPLICATION

2-64

4513/4514 Group User’s Manual

2.10 Oscillation circuit

2.10.2 Oscillation operation

System clock is supplied to CPU and peripheral device as the standard clock for the microcomputer

operation. For the 4513/4514 Group, the clock (f(XIN)), (f(XIN)/2) which is supplied from the oscillation

circuit is selected with the register MR.

Figure 2.10.2 shows the structure of the clock control circuit.

Fig. 2.10.2 Structure of clock control circuit

2.10.3 Notes on use

(1)

Value of a part connected to an oscillator

Values of a capacitor and a resistor of the oscillation circuit depend on the connected oscillator and

the board. Accordingly, consult the oscillator manufacturer for values of each part connected the

oscillator.

Instruction clock

MR3

RESET

Falling detected

Ports P00, P01

Ports P02, P03

Ports P10, P11

Ports P12, P13

Multi-

plexer

K00,K01,K02,K03

Counter

Wait time (Note)

control circuit

Software

start signal

POF instruction

XIN

XOUT

I12

P30/INT0

Key-on wake up control register

I22

P31/INT1

Oscillation

circuit

Division circuit

(divided by 2)

Internal clock

generation circuit

(divided by 3)

“H” level

“L” level

“H” level

Note: The wait time control circuit is used to generate the time required to stabilize the f(XIN) oscillation.

System clock

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