3886 datasheet(85/380 Pages) RENESAS

85 / 380 page

HARDWARE

1-60

3886 Group User’s Manual

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 2.7 V

and 5.5 V (4.0 V to 5.5 V for flash memory version), and the oscil-

lation should be stable), reset is released. After the reset is

completed, the program starts from the address contained in ad-

dress FFFD16 (high-order byte) and address FFFC16 (low-order

byte). Make sure that the reset input voltage is less than 0.54 V for

VCC of 2.7 V. For flash memory version, make sure that the reset

input voltage is less than 0.8 V for Vcc of 4.0 V.

Fig. 58 Reset sequence

Fig. 57 Reset circuit example

FUNCTIONAL DESCRIPTION

(Note)

0.2VCC

Poweron

VCC

RESET

VCC

RESET

Power source

voltage detection

circuit

Power source

voltage

Reset input

voltage

Note : Reset release voltage ; Vcc=2.7 V

(Vcc = 4.0 V for flash memory version)

RESET

Internal

reset

Data

Address

SYNC

XIN: 10.5 to 18.5 clock cycles

XIN

FFFCFFFD

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

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