Flowcharts and pseudocodes
M58LT256JST, M58LT256JSB
Figure 26. Protection Register program flowchart and pseudocode
Start
protection_register_program_command (addressToProgram, dataToProgram) {:
writeToFlash (addressToProgram, 0xC0) ;
/*see note (3) */
Write C0h (3)
writeToFlash (addressToProgram, dataToProgram) ;
/*Memory enters read status state after
the Program Command*/
Write Address
& Data
do {
Read Status
Register (3)
status_register=readFlash (addressToProgram) ;
/* see note (3) */
/* E or G must be toggled*/
NO
SR7 = 1
YES
} while (status_register.SR7== 0) ;
NO
V
Invalid
if (status_register.SR3==1) /*VPP invalid error */
error_handler ( ) ;
PP
SR3 = 0
YES
Error (1, 2)
NO
NO
Program
Error (1, 2)
if (status_register.SR4==1) /*program error */
error_handler ( ) ;
SR4 = 0
YES
Program to Protected
Block Error (1, 2)
if (status_register.SR1==1) /*program to protect block error */
error_handler ( ) ;
SR1 = 0
YES
End
}
AI06177b
1. Status check of SR1 (Protected Block), SR3 (VPP Invalid) and SR4 (Program Error) can be made after each program
operation or after a sequence.
2. If an error is found, the Status Register must be cleared before further Program/Erase Controller operations.
3. Any address within the bank can equally be used.
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NUMONYX [ NUMONYX B.V ]
