Z8F0830HH020SG Datasheet, PDF (43/257 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore!^® F0830 Series
Product Specification
25
The Voltage Brown-Out circuit can be either enabled or disabled during STOP Mode.
Operations during STOP Mode is set by the VBO_AO Flash option bit. See the Flash
Option Bits chapter on page 124 for information about configuring VBO_AO.
V_DD = 3.3V
V_POR
V_VBO
Program
Execution
Voltage
Brown-Out
V_DD = 3.3V
Program
Execution
WDT Clock
System Clock
Internal RESET
signal
Note: Not to Scale
POR
counter delay
Figure 7. Voltage Brown-Out Reset Operation
Watchdog Timer Reset
If the device is operating in NORMAL or STOP Mode, the Watchdog Timer can initiate a
system reset at time-out if the WDT_RES Flash option bit is programmed to 1; this state is
the unprogrammed state of the WDT_RES Flash option bit. If the bit is programmed to 0,
it configures the Watchdog Timer to cause an interrupt – not a system reset – at time-out.
The WDT status bit in the Reset Status (RSTSTAT) Register is set to 1 to signify that the
reset was initiated by the Watchdog Timer.
External Reset Input
The RESET pin has a Schmitt-triggered input and an internal pull-up resistor. After the
RESET pin is asserted for a minimum of four system clock cycles, the device progresses
through the system reset sequence. Because of the possible asynchronicity of the system
PS025113-1212
Reset Sources