ST10F168 datasheet(40/74 Pages) STMICROELECTRONICS

40 / 74 page

ST10F168

40/74

The simplest way to reset the ST10F168 is to

insert a capacitor C1 between RSTIN pin and VSS,

and a capacitor between VPP pin and VSS (C0)

with a pullup resistor R0 between VPP pin and

VCC. The input RSTIN provides an internal pullup

device equalling a resistor of 50k

Ω to 150kΩ (the

minimum reset time must be determined by the

lowest value). Select C1 that produce a sufficient

discharge time to permit the internal or external

oscillator and / or internal PLL to stabilize.

To insure correct power-up reset with controlled

supply current consumption, specially if clock sig-

nal requires a long period of time to stabilized, an

asynchronous hardware reset is required during

power-up. It is recommended to connect the exter-

nal R0C0 circuit shown in Figure 12 to the VPP

pin. On power-up, the logical low level on VPP pin

forces an asynchronous harware reset when

RSTIN is asserted.

The external pullup R0 will then charge the capac-

itor C0. Note that an internal pulldown device on

VPP pin is turned on when RSTIN pin is low, and

causes the external capacitor (C0) to begin dis-

charging at a typical rate of 100

µA to 200µA. With

this mechanism, after power-up reset, short low

pulses applied on RSTIN produce synchronous

hardware reset. If RSTIN is asserted longer than

the time needed for C0 to be discharged by the

internal pulldown device, then the device is forced

in an asynchronous reset. This mechanism

insures recovery from very catastrophic failure.

Figure 12 : Minimum External Reset Circuitry

RSTOUT

VPP

RSTIN

a) Hardware

VCC

ST10F168

b) For Power-up

(and Interruptible

Power-down

External Hardware

Reset

mode)

Reset

Figure 13 : Internal (simplified) Reset Circuitry

RSTOUT

EINIT Instruction

Trigger

Clr

Clock

Reset State

Machine

Internal

Reset

Signal

Reset Sequence

(512 CPU Clock Cycles)

SRST instruction

watchdog overflow

RSTIN

VCC

BDRSTEN

VCC

VPP (Flash device)

VPP

Weak Pulldown

(~200

µA)

From/to Exit

Powerdown

Circuit

Asynchronous

Reset

Clr

Set

ST10F168 数据表(PDF) 40 Page - STMicroelectronics

ST10F168 数据表(HTML) 40 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

数据表下载

链接网址

ST10F168 数据表(PDF) 40 Page - STMicroelectronics

ST10F168 数据表(HTML) 40 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

数据表 下载

链接网址

数据表下载