UPSD3233 datasheet(107/170 Pages) STMICROELECTRONICS

107 / 170 page

107/170

uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV

Suspend Sector Erase. When a Sector Erase

cycle is in progress, the Suspend Sector Erase in-

struction can be used to suspend the cycle by writ-

ing 0B0h to any address when an appropriate

Sector Select (FS0-FS7 or CSBOOT0-CSBOOT3)

is High. (See Table 85., page 101). This allows

reading of data from another Flash memory sector

after the Erase cycle has been suspended. Sus-

pend Sector Erase is accepted only during an

Erase cycle and defaults to READ Mode. A Sus-

pend Sector Erase instruction executed during an

Erase time-out period, in addition to suspending

the Erase cycle, terminates the time out period.

The Toggle Flag Bit (DQ6) stops toggling when the

internal logic is suspended. The status of this bit

must be monitored at an address within the Flash

memory sector being erased. The Toggle Flag Bit

(DQ6) stops toggling between 0.1µs and 15µs af-

ter the Suspend Sector Erase instruction has been

executed. The Flash memory is then automatically

set to READ Mode.

If an Suspend Sector Erase instruction was exe-

cuted, the following rules apply:

–

Attempting to read from a Flash memory

sector that was being erased outputs invalid

data.

–

Reading from a Flash sector that was

not

being erased is valid.

–

The Flash memory

cannot be programmed,

and only responds to Resume Sector Erase

and Reset Flash instructions (READ is an

operation and is allowed).

–

If a Reset Flash instruction is received, data in

the Flash memory sector that was being

erased is invalid.

Resume Sector Erase. If

Suspend

Sector

Erase instruction was previously executed, the

erase cycle may be resumed with this instruction.

The Resume Sector Erase instruction consists of

writing 030h to any address while an appropriate

Sector Select (FS0-FS7 or CSBOOT0-CSBOOT3)

is High. (See Table 85., page 101.)

Specific Features

Flash Memory Sector Protect. Each

primary

and secondary Flash memory sector can be sepa-

rately protected against Program and Erase cy-

cles. Sector Protection provides additional data

security because it disables all Program or Erase

cycles. This mode can be activated through the

JTAG Port or a Device Programmer.

Sector protection can be selected for each sector

using the PSDsoft Express Configuration pro-

gram. This automatically protects selected sectors

when the device is programmed through the JTAG

Port or a Device Programmer. Flash memory sec-

tors can be unprotected to allow updating of their

contents using the JTAG Port or a Device Pro-

grammer. The MCU can read (but cannot change)

the sector protection bits.

Any attempt to program or erase a protected Flash

memory sector is ignored by the device. The Verify

operation results in a READ of the protected data.

This allows a guarantee of the retention of the Pro-

tection status.

The sector protection status can be read by the

MCU through the Flash memory protection regis-

ters (in the CSIOP block). See Tables 87 and 88.

Table 87. Sector Protection/Security Bit Definition – Flash Protection Register

Note: 1. Bit Definitions:

Sec_Prot 1 = Primary Flash memory or secondary Flash memory Sector is write-protected.

Sec_Prot 0 = Primary Flash memory or secondary Flash memory Sector is not write-protected.

Table 88. Sector Protection/Security Bit Definition – Secondary Flash Protection Register

Note: 1. Bit Definitions:

Sec_Prot 1 = Secondary Flash memory Sector is write-protected.

Sec_Prot 0 = Secondary Flash memory Sector is not write-protected.

Security_Bit 0 = Security Bit in device has not been set; 1 = Security Bit in device has been set.

Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1

Bit 0

Sec7_Prot

Sec6_Prot

Sec5_Prot

Sec4_Prot

Sec3_Prot

Sec2_Prot

Sec1_Prot

Sec0_Prot

Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1

Bit 0

Security_Bit

not used

Sec3_Prot

Sec2_Prot

Sec1_Prot

Sec0_Prot

UPSD3233 датащи(PDF) 107 Page - STMicroelectronics

UPSD3233 датащи(HTML) 107 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL