M38K09RFS datasheet(93/328 Pages) RENESAS

93 / 328 page

FUNCTIONAL DESCRIPTION

Rev.2.00

Oct 05, 2006

page 76 of 112

38K0 Group

REJ09B0337-0200

HARDWARE

Fig. 107 Example of reset circuit

Fig. 108 Reset sequence

0 V

VCC

RESET

VCC

RESET

(Note)

0.2VCC

Poweron

Power

source

voltage

Reset input

voltage

Note : Reset release voltage ;

Vcc = 3.0 V (L version)

Power source

voltage detection

circuit

RESET

Internal

reset

Data

Address

SYNC

XIN: 10.5 to 18.5 clock cycles

XIN

FFFC

FFFD

ADH,L

ADL

ADH

1: The frequency relation of f(XIN) and f(

φ) is f(XIN)=8 • f(φ).

2: The question marks (?) indicate an undefined state that depends on the previous state.

Reset address from the vector table.

Notes

RESET CIRCUIT

To reset the microcomputer, RESET pin should be held at an “L”

level for 16 cycles or more of XIN. Then the RESET pin is returned

to an “H” level (the power source voltage should be between 3.0 V

and 5.25 V for L version, and the oscillation should be stable), re-

set is released. After the reset is completed, the program starts

from the address contained in address FFFD16 (high-order byte)

and address FFFC16 (low-order byte). Make sure that the reset in-

put voltage is under 0.6 V for VCC of 3.0 V (L version).

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