ST10F167 datasheet(16/69 Pages) STMICROELECTRONICS

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ST10F167

b3 = FCVPP:

Flash V

PP control bit. This read-only

bit indicates that the V

PP voltage fell below the val-

id threshold value during a Flash programming or

erase operation. If FCVPP is set to ”1” after such

an operation has finished, it can mean that the op-

eration was not successful. The VPP power supply

should be checked and the operation repeated. If

FCVPP is set to ”0”, no critical discontinuity in V

occurred. At reset FCVPP is set to ”0”.

b2 = FBUSY:

Flash busy bit. This read-only bit in-

dicates that a Flash programming or erase opera-

tion is in progress. FBUSY is set to ”1” by hard-

ware, as soon as the programming or erase com-

mand is given. At reset FBUSY is set to ”0”. Note

that this bit position is also occupied by the write-

only bit RPROT.

b2 = RPROT:

Protection enable bit. This bit set at

1, anded with the OTP protection bit, disables any

access to the Flash, by instructions fetched from

the external memory space, or from the internal

RAM. This write-only bit, is only significant if the

general Flash memory protection is enabled. If the

protection is enabled, the setting of RPROT deter-

mines whether the Flash protection is active

(RPROT=”1”) or inactive (RPROT=”0”). RPROT is

the only FCR bit which can be modified even in the

Flash standard operation mode, but only by an in-

struction executed from the Flash memory itself.

At reset, RPROT is set to ”1”. Note that this bit po-

sition is also occupied by the read-only bit FBUSY.

b1 = FEE:

Flash erase/program selection. This bit

selects the Flash write operation to be performed:

erase (FEE=”1”) or programming (FEE=”0”). To-

gether with bits FWE and FWMSET, bit FEE deter-

mined the operation mode of the Flash memory.

Note that setting bits FWE and FEE causes the

corresponding Flash operation mode to be select-

ed but does not launch the execution of the select-

ed operation. If bit FWE was set to ”0”, the setting

of FEE is insignificant. At reset, FEE is set to ”0”.

b0 = FWE:

Flash write/read enable. This bit deter-

mines whether FLASH write operations are ena-

bled (FWE=1) or disabled (FWE=0). By definition,

a FLASH write operation can be either program-

ming or erasure. Together with bits FEE and

FWMSET, bit FWE determines the operation

mode of the Flash memory. Note that setting bits

FWE and FEE causes the corresponding Flash

operation mode to be selected but does not launch

the execution of the selected operation. If bit FWE

was set to ”1”, any read access on a Flash memo-

ry location means a particular program-verify or

erase-verify read operation. Flash write operations

are disabled at reset.

6.3

Flash Memory Security

Security and reliability have been enhanced by

built-in features: a key code sequence is used to

enter the Write/Erase mode preventing false write

cycles, a programmable option (set by the pro-

gramming board) prevents access to the FLASH

memory from the internal RAM or from External

Memory. If the security option is set, the FLASH

memory can only be accessed from a program

within the FLASH memory area. This protection

can only be disabled by instructions executed from

the FLASH memory.

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