Samsung manual EIexternal interrupt enable, Reset Sources of The S3F80JB

Models: S3F80JB

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RESET

S3F80JB

 

 

STOP

IPOR / LVD Contorl Bit '1'

(smart option bit[7] @03FH)

LVD

IPOR / LVD Contorl Bit '1' (smart option bit[7] @03FH)

STOP

IPOR

 

 

Watchdog Timer

1

 

 

2

 

 

3

RESET

nRESET

4

5

 

 

 

 

6

 

P0&P2 (INT0-INT9)

(EI)external interrupt enable

(smart option bit[7] @03FH) IPOR / LVD Contorl Bit '1'

STOP

P0 & P2.4-2.7

(smart option bit[7] @03FH) IPOR / LVD Contorl Bit '1'

STOP

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.

8-2

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Samsung manual EIexternal interrupt enable, Reset Sources of The S3F80JB