M38197E 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M38197E

SINGLE-CHIP 8-BIT MICROCOMPUTER

MITSUBISHI ELECTRIC  

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 2.8 V and 5.5

V, and XIN oscillation is stable), reset is released. In order to give

the XIN clock time to stabilize, internal operation does not begin

until after about 4000 XIN clock cycles (256 cycles of f(XIN)/16) are

completed. After the reset is completed, the program starts from

the address contained in address FFFD16 (high-order) and ad-

dress FFFC16 (low-order). Make sure that the reset input voltage

is 0.5 V or less for 2.8 V of VCC.

MITSUBISHI MICROCOMPUTERS

3819 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

RESET

Poweron

Power source

voltage

VCC 0 V

(Note)

Reset input

voltage

0V

0.2VCC

Note : Reset release voltage : VCC = 2.8 V

RESET

VCC

Power source voltage

detection circuit

Fig. VB-2 Example of reset circuit

XIN

φ

RESET

Internal reset

Address

Data

SYNC

?

?

?

?

FFFC

FFFD ADH, ADL

?

?

?

?

ADL

ADH

Reset address from

vector table

about 4000

Notes 1 : f(XIN) and f(φ) are in the relationship : f(XIN) = 8•f(φ)

XIN clock cycles

2 : A question mark (?) indicates an undefined state that depends on the previous state.

Fig. VB-2 Reset sequence

45

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