ST10F276Z5 datasheet(124/239 Pages) STMICROELECTRONICS

124 / 239 page

System reset

ST10F276Z5

124/239

Figure 36.

SW / WDT bidirectional RESET (EA=0) followed by a HW RESET

19.7

Reset circuitry

Internal reset circuitry is described in Figure 39. The RSTIN pin provides an internal pull-up

resistor of 50k

Ω to 250kΩ (The minimum reset time must be calculated using the lowest

value).

It also provides a programmable (BDRSTEN bit of SYSCON register) pull-down to output

internal reset state signal (synchronous reset, watchdog timer reset or software reset).

This bidirectional reset function is useful in applications where external devices require a

reset signal but cannot be connected to RSTOUT pin.

This is the case of an external memory running codes before EINIT (end of initialization)

instruction is executed. RSTOUT pin is pulled high only when EINIT is executed.

The RPD pin provides an internal weak pull-down resistor which discharges external

capacitor at a typical rate of 200

µA. If bit PWDCFG of SYSCON register is set, an internal

pull-up resistor is activated at the end of the reset sequence. This pull-up will charge any

capacitor connected on RPD pin.

The simplest way to reset the device is to insert a capacitor C1 between RSTIN pin and VSS,

and a capacitor between RPD pin and VSS (C0) with a pull-up resistor R0 between RPD pin

and VDD. The input RSTIN provides an internal pull-up device equalling a resistor of 50kΩ to

250k

Ω (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 and the on-chip voltage regulator to stabilize.

P0[15:13]

not transparent

RSTF

P0[12:8]

transparent

not t.

P0[1:0]

not t.

not transparent

RST

1024 TCL

RSTOUT

At this time RSTF is sampled LOW

so HW Reset is entered

(After Filter)

RSTIN

≤ 500 ns

≥ 50 ns

ALE

8 TCL

≤ 500 ns

≥ 50 ns

P0[7:2]

not transparent

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