Renesas PCA4738F-80A Manual de usuario descargar pdf (Pagina 36)

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

RESET

Internal

reset

Address

Data

SYNC

FFFC FFFD

H, ADL

ADL

????

XIN : about 8000 cycles

Note

Reset address from

vector table

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.

ADH

(Note)

0.2V

Poweron

RESET

Power source

voltage detection

circuit

Power source

voltage

Reset input

voltage

Note : Reset release voltage ; Vcc=2.5 V

RESET CIRCUIT

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

for 2 µs or more. Then the RESET pin is returned to an “H” level (the

power source voltage should be between 2.5 V and 5.5 V, and the

oscillation should be stable), reset is released. After the reset is com-

pleted, the program starts from the address contained in address

FFFD

16 (high-order byte) and address FFFC16 (low-order byte). Make

sure that the reset input voltage is less than 0.5 V for V

CC of 2.5 V

(switching to the high-speed mode, a power source voltage must be

between 4.0 V and 5.5 V).

Fig. 38 Reset sequence

Fig. 37 Reset circuit example

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 63 64

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Renesas PCA4738F-80A Manual de usuario Pagina 36

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