M38K09RFS datasheet(97/328 Pages) RENESAS

97 / 328 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 05, 2006

page 80 of 112

38K0 Group

REJ09B0337-0200

HARDWARE

Fig. 114 System clock generating circuit block diagram (single-chip mode)

Fig. 111 Ceramic resonator or quartz-crystal oscilltor circuit

Fig. 112 External clock input circuit

Fig. 113 Structure of MISRG

CIN

COUT

XIN

XOUT

Note : Insert a damping resistor if required.

The resistance will vary depending on the oscillator

and the oscillation drive capacity setting.

Use the value recommended by the maker of the

oscillator.

Also, if the oscillator manufacturer's data sheet

specifies that a feedback resistor be added external

to the chip though a feedback resistor exists on-chip,

insert a feedback resistor between XIN and XOUT

following the instruction.

Rd (Note)

XOUT

External oscillation circuit

Open

VCC

VSS

XIN

MISRG

(MISRG: address 0FFB16)

Oscillation stabilizing time set after STP instruction

released bit

0: Automatically set “0116” to Timer 1,

“FF16” to Prescaler 12

1: Automatically set nothing

Not used (indefinite at read)

PLL

1/8

1/41/6

fUSB

XIN

XOUT

fsio

fAD

1/8

1/4

1/2

1/1

1/2

FF16

0116

1/2

fvco

fSYN

USB clock selection bit

USB clock division

ration selection bits

System clock division

ration selection bits

Timer 1

Prescaler 12

Reset or STP

instruction

Timing

φ (internal clock)

STP instruction

WIT

instruction

STP instruction

Reset

Interrupt request

Interrupt disable flag l

System clock selection bit

Reset

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