Samsung S3F80JB - Manual (Page 220)

RESET S3F80JB
8-2
nRESET
Watchdog Timer
(smart option bit[7] @03FH)
IPOR / LVD Contorl Bit '1'
STOP
(EI)external interrupt enable
P0&P2
(INT0-INT9)
STOP
IPOR / LVD Contorl Bit '1'
(smart option bit[7] @03FH)
LVD
STOP
IPOR
IPOR / LVD Contorl Bit '1'
(smart option bit[7] @03FH)
(smart option bit[7] @03FH)
IPOR / LVD Contorl Bit '1'
STOP
P0 & P2.4-2.7
RESET
1
2
3
4
5
6
Figure 8-1. RESET Sources of The S3F80JB
1. When IPOR/LVD Control Bit of smart option is set to ‘1’, the rising edge detection of LVD circuit while rising of
VDD passes the level of VLVD.
2. When IPOR/LVD Control Bit of smart option is set to ‘0’ and mode is in STOP Mode, reset is generated by
internal power-on reset.
3. Basic Timer over-flow for watchdog timer. See the chapter 11. Basic Timer and Timer 0 for more
understanding.
4. The reset pulse generation by transiting of reset pin (nRESET) from low level to high level on the condition
that VDD is higher level state than VLVD (Low level Detect Voltage).
5. When IPOR/LVD Control Bit (smart option bit [7] @ 03FH) is set to ‘0’ and chip is in stop mode, external
interrupt input by P0 and P2 regardless of external interrupt enable/disable generates the reset signal.