Z8F042ASJ020EG2156 Datasheet, PDF (46/280 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
30
Table 11. Reset Status Register (RSTSTAT)
Bit
7
6
5
4
3
2
1
0
Field
POR
STOP
WDT
EXT
Reserved
LVD
RESET
See descriptions below
0
0
0
0
0
R/W
R
R
R
R
R
R
R
R
Address
FF0H
Bit
[7]
POR
[6]
STOP
[5]
WDT
[4]
EXT
[3:1]
[0]
LVD
Description
Power-On Reset Indicator
If this bit is set to 1, a Power-On Reset event occurs. This bit is reset to 0 if a WDT time-out or
Stop Mode Recovery occurs. This bit is also reset to 0 when the register is read.
Stop Mode Recovery Indicator
If this bit is set to 1, a Stop Mode Recovery occurs. If the Stop and WDT bits are both set to 1,
the Stop Mode Recovery occurs because of a WDT time-out. If the Stop bit is 1 and the WDT
bit is 0, the Stop Mode Recovery was not caused by a WDT time-out. This bit is reset by a
Power-On Reset or a WDT time-out that occurred while not in Stop Mode. Reading this register
also resets this bit.
Watchdog Timer Time-Out Indicator
If this bit is set to 1, a WDT time-out occurs. A POR resets this pin. A Stop Mode Recovery
from a change in an input pin also resets this bit. Reading this register resets this bit. This read
must occur before clearing the WDT interrupt.
External Reset Indicator
If this bit is set to 1, a Reset initiated by the external RESET pin occurs. A Power-On Reset or
a Stop Mode Recovery from a change in an input pin resets this bit. Reading this register
resets this bit.
Reserved
These bits are reserved and must be programmed to 000.
Low Voltage Detection Indicator
If this bit is set to 1 the current state of the supply voltage is below the low voltage detection
threshold. This value is not latched but is a real-time indicator of the supply voltage level.
PS022828-0413
PRELIMINARY
Reset Register Definitions