ZUSBOPTSC01ZACG datasheet(39/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

Reset, Stop Mode Recovery and Low

Z8 Encore! XP® F082A Series

Product Specification

Reset, Stop Mode Recovery and Low

Voltage Detection

The Reset Controller within the Z8 Encore! XP F082A Series controls Reset and Stop

Mode Recovery operation and provides indication of low supply voltage conditions. In

typical operation, the following events cause a Reset:

•

Power-On Reset (POR)

•

Voltage Brown-Out (VBO)

•

Watchdog Timer time-out (when configured by the WDT_RES Flash option bit to ini-

tiate a reset)

•

External RESET pin assertion (when the alternate RESET function is enabled by the

GPIO Register)

•

On-chip debugger initiated Reset (OCDCTL[0] set to 1)



When the device is in STOP Mode, a Stop Mode Recovery is initiated by either of the fol-

lowing occurrences:

•

Watchdog Timer time-out

•

GPIO Port input pin transition on an enabled Stop Mode Recovery source



The low voltage detection circuitry on the device (available on the 8-pin product versions

only) performs the following functions:

•

Generates the VBO reset when the supply voltage drops below a minimum safe level.

•

Generates an interrupt when the supply voltage drops below a user-defined level (8-pin

devices only).

Reset Types

The Z8 Encore! XP F082A Series provides several different types of Reset operation. Stop

Mode Recovery is considered as a form of Reset. Table 8 lists the types of Reset and their

operating characteristics. The System Reset is longer if the external crystal oscillator is

enabled by the Flash option bits, allowing additional time for oscillator start-up.

ZUSBOPTSC01ZACG 数据表(PDF) 39 Page - Zilog, Inc.

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