Samsung S3F401F - Manual (Page 65)

S3F401F_UM_REV1.00 INTERNAL FLASH ROM
5-5
4.3 OPTION PROGRAM
START
; Protection/Smart option register address set
; Option Bit set
; Key value set whenenver starts
; Program command select & start
Command: FMUCON.5-UOPGMR
; Check command bit to know
if operation is completed or not
FINISH
Yes
No
FMADDR 0x00000E38 or 0x00000E3C
FMDATA Option Bit Set
; Enable flash osc
; Compare End address
FMKEY 0x5A5A5A5A
FMUCON + UOSCEN Bit
FMUCON + CommandBit + CPUStatus Bit + Start Bit
FMADDR 0x00000E38 or 0x00000E3C
FMDATA Other Option Bit Set
+
Yes
No
Another instruction can be
executed in SRAM/SDRAM
32-bit Data Writing
Command Bit Clear
CPUHOLD?
COUNT=END?
Figure 5-3. Option Program Flowchart