Samsung S3F80JB manual Flash Memory Control Registers User Program Mode

EMBEDDED FLASH MEMORY INTERFACE S3F80JB

FLASH MEMORY CONTROL REGISTERS (USER PROGRAM MODE)

FLASH MEMORY CONTROL REGISTER (FMCON)

FMCON register is available only in user program mode to select the flash memory operation mode; sector erase, byte programming, and to make the flash memory into a hard lock protection.

MSB

Flash Memory Control Register (FMCON)

EFH , Set1 , Bank1 , R/W

.7 .6 .5 .4 .3 .2 .1 .0

LSB

Flash Memory Mode Selection Bits 0101: Programming mode

1010: Erase mode

0110: Hard lock mode

others: Not used for S3F80JB

Not used for S3F80JB.

Flash (Erase or Hard Lock Protection) Operation Start Bit

0 = Operation stop

1 = Operation start

(This bit will be cleared automatically just after erase operation.)

Figure 15-3. Flash Memory Control Register (FMCON)

The bit 0 of FMCON register (FMCON.0) is a bit for the operation start of Erase and Hard Lock Protection. Therefore, operation of Erase and Hard Lock Protection is activated when you set FMCON.0 to “1”. If you write FMCON.0 to 1 for erasing, CPU is stopped automatically for erasing time (min.10ms). After erasing time, CPU is restarted automatically. When you read or program a byte data from or into flash memory, this bit is not needed to manipulate.

FLASH MEMORY USER PROGRAMMING ENABLE REGISTER (FMUSR)

The FMUSR register is used for a safe operation of the flash memory. This register will protect undesired erase or program operation from malfunctioning of CPU caused by an electrical noise. After reset, the user-programming mode is disabled, because the value of FMUSR is “00000000B” by reset operation. If necessary to operate the flash memory, you can use the user programming mode by setting the value of FMUSR to “10100101B”. The other value of “10100101B”, user program mode is disabled.

Flash Memory User Programming Enable Register (FMUSR)

EEH, Set1, Bank 1, R/W

MSB

.7

.6

.5

.4

.3

.2

.1

.0

LSB

Flash Memory User Programming Enable Bits 10100101: Enable user programming mode Other values: Disable user programming mode

Figure 15-4. Flash Memory User Programming Enable Register (FMUSR)

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