Datasheet > 84C84X

84C84X

更新时间： 2022-11-26 05:31:39

品牌	Logo	应用领域
恩智浦 - NXP		微控制器
页数	文件大小	规格书
38页	267K
描述
8-bit microcontrollers with OSD and VST

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84C84X 数据手册

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers with OSD and VST

84C44X; 84C64X; 84C84X

RESET

7.1

Power-on-reset

The RESET pin (active LOW input) is used to initialize the

microcontroller to a defined state. The Reset configuration

is shown in Fig.5.

The Power-on-reset circuit monitors the voltage level of

V_DD. If V_DDremains below the internal reference voltage

level V_ref(typically 1.3 V), the oscillator is inhibited.

When V_DDrises above V_ref, the oscillator is released and

the internal reset is active for a period of t_d(typically

50 µs).

Considering the V_DDrise time, the following measures for

a correct Power-on-reset can be taken:

handbook, halfpage

• If the V_DDrises above the minimum operation voltage

before time period t_dis exceeded, no external

components are necessary (see Fig.6).

100 kΩ

RESET

• If V_DDhas a slow rise time, such that after the time

period(t_Vref+ t_d) has elapsed the supply voltage is still

below the minimum operation voltage (V_min),

external components are required (see Figs 4 and 7).

To guarantee a correct reset operation, ensure that

MCD174

the time constant RC ≥ 8 × t_VDD

A definite Power-on-reset can be realized by applying an

(external) RESET signal during power-on.

Fig.4 External components for RESET pin.

handbook, full pagewidth

oscillator

inhibit

POWER

RESET

ref

RESET

internal

reset

MLA651

Fig.5 Reset configuration.

October 1994

1...4 5 678 9 10...38

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