M38039G8HKP datasheet(62/92 Pages) RENESAS

62 / 92 page

Rev.1.10

Nov 14, 2005

Page 62 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

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 1.8 V and 5.5 V, and the oscillation should be stable),

reset 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

input voltage is less than 0.29 V for VCC of 1.8 V.

Fig 56. Reset circuit example

Fig 57. Reset sequence

VCC

RESET

VCC

RESET

Power source voltage

detection circuit

Example at VCC = 5 V

1.8 V

0 V

VCC

RESET

0.29 V or less

RESET

Internal

reset

Data

Address

SYNC

XIN

FFFC

FFFD

ADH,L

?ADL

ADH

Notes 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.

XIN : 10.5 to 18.5 clock cycles

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