HMS81C2012A Datasheet, PDF (89/107 Pages) List of Unclassifed Manufacturers – CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver

HMS81C2012A/2020A
RESET VECTOR
PFS =1
YES
NO
RAM CLEAR
INITIALIZE RAM DATA
INITIALIZE ALL PORTS
INITIALIZE REGISTERS
PFS = 0
Skip the
initial routine
FUNTION
EXECUTION
Figure 20-2 Example S/W of RESET flow by Power fail
When PFR = 1
V_DD
Internal
RESET
V_DD
Internal
RESET
V_DD
Internal
RESET
64mS
t <64mS
64mS
64mS
Figure 20-3 Power Fail Processor Situations
V_PFDMAX
V_PFDMIN
V_PFDMAX
V_PFDMIN
V_PFDMAX
V_PFDMIN
SEP. 2004 Ver 2.00
85