7516 datasheet(44/90 Pages) RENESAS

44 / 90 page

Rev.1.01

Jul 01, 2003

page 44 of 89

7516 Group

RESET CIRCUIT

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

level for 20 cycles or more of XIN. Then the RESET pin is returned

to an “H” level (the power source voltage must be between 2.7 V

and 5.5 V, and the oscillation must 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 0.54 V for VCC of 2.7 V.

Fig. 50 Reset sequence

Fig. 49 Reset circuit example

(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

RESET

Data

Address

SYNC

XIN: 8 to 13 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.

3: All signals except XIN and RESET are internals.

Reset address from the vector table.

Notes

RESETOUT

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