Samsung S3F401F - Manual (Page 66)

INTERNAL FLASH ROM S3F401F_UM_REV1.00
5-6
4.4 SECTOR ERASE
; Address set
; Data set
; Key value set whenenver starts
; Program command select & start
Command: FMUCON.1 - USERSR
; Check command bit to know
if operation is completed or not
; Next address/data set
FINISH
No
Yes
FMADDR Sector Base Address
; Enable flash osc
; Compare End address
FMKEY 0x5A5A5A5A
FMUCON + UOSCEN Bit
FMUCON + CommandBit + CPUStatus Bit + Start Bit
FMADDR New 32-bit Address
FMDATA New 32-bit Data
COUNT=END?
START
No
+
Yes
Another instruction can be
executed in SRAM/SDRAM
32-bit Data Writing
Command Bit Clear
CPUHOLD?
Figure 5-4. Sector Erase Flowchart