Z8F0830HH020SG Datasheet, PDF (39/257 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore!^® F0830 Series
Product Specification
21
Reset and Stop Mode Recovery
The reset controller in the Z8 Encore! F0830 Series controls RESET and Stop Mode
Recovery operations. In a typical operation, the following events can 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
initiate 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 event is initiated by either of
the following occurrences:
• A Watchdog Timer time-out
• A GPIO port input pin transition on an enabled Stop Mode Recovery source
The VBO circuitry on the device generates a VBO reset when the supply voltage drops
below a minimum safe level.
Reset Types
The Z8 Encore! F0830 Series provides different types of Reset operations. Stop Mode
Recovery is considered a form of reset. Table 9 lists the types of resets and their operating
characteristics. The duration of a system reset is longer if the external crystal oscillator is
enabled by the Flash option bits; the result is additional time for oscillator startup.
PS025113-1212
Reset and Stop Mode Recovery