PSD835G2 datasheet(27/102 Pages) STMICROELECTRONICS

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PSD835G2

Table 28. Instructions

Note: 1. All bus cycles are WRITE bus cycles, except the ones with the “Read” label

2. All values are in hexadecimal:

X = Don’t Care.

RA = Address of the memory location to be read

RD = Data read from location RA during the READ cycle

PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of Write Strobe (WR, CNTL0).

PA is an even address for PSD in word programming mode.

PD = Data to be programmed at location PA. Data is latched on the rising edge of Write Strobe (WR, CNTL0)

SA = Address of the sector to be erased or verified. The Sector Select pins (FS0-FS7 or CSBOOT0-CSBOOT3) of the sector or

whole memory to be erased, or verified, must be Active (High).

3. Sector Select (FS0-FS7 or CSBOOT0-CSBOOT3) signals are active High, and are defined in PSDsoft.

4. Only address Bits A11-A0 are used in instruction decoding. A15-A12 (or A16-A12) are don’t care.

5. No Unlock or instruction cycles are required when the device is in the READ mode

6. The Reset instruction is required to return to the READ mode after reading the Flash ID, or after reading the Sector Protection Sta-

tus, or if the Error Flag Bit (DQ5/DQ13) goes High.

7. Additional sectors to be erased must be written at the end of the Sector Erase instruction within 80µs.

8. The data is 00h for an unprotected sector, and 01h for a protected sector. In the fourth cycle, the Sector Select is active, and

(A1,A0)=(1,0)

9. The Unlock Bypass instruction is required prior to the Unlock Bypass Program instruction.

10. The Unlock Bypass Reset Flash instruction is required to return to reading memory data when the device is in the Unlock Bypass

mode.

11. The system may perform READ and Program cycles in non-erasing sectors, read the Flash ID or read the Sector Protection Status

when in the Suspend Sector Erase mode. The Suspend Sector Erase instruction is valid only during a Sector Erase cycle.

12. The Resume Sector Erase instruction is valid only during the Suspend Sector Erase mode.

13. The MCU cannot invoke these instructions while executing code from the same Flash memory as that for which the instruction is

intended. The MCU must fetch, for example, the code from the secondary Flash memory when reading the Sector Protection Status

of the primary Flash memory.

Instruction

FS0-FS7 or

CSBOOT0-

CSBOOT3

Cycle 1

Cycle 2

Cycle 3

Cycle 4

Cycle 5

Cycle 6

Cycle 7

Read(5)

“Read” RA

@ RD

Read Primary

Flash ID(6,13)

AAh@ 555h

55h@

AAAh

90h@

555h

Read identifier

@X01h

Read Sector

Protection(6,8,13)

AAh@ 555h

55h@

AAAh

90h@

555h

Read identifier

00h or 01h

@X02h

Program a Flash

Byte(13)

AAh@ 555h

55h@

AAAh

A0h@

555h

PD@ PA

Flash Sector

Erase(7)

AAh@ 555h

55h@

AAAh

80h@

555h

AAh@ 555h

55h@

AAAh

30h@

30h(7)@

next SA

Flash Bulk Erase

AAh@ 555h

55h@

AAAh

80h@

555h

AAh@ 555h

55h@

AAAh

10h@

555h

Suspend Sector

Erase(11)

B0h@

XXXh

Resume Sector

Erase(12)

30h@ XXXh

Reset(6)

F0h@

any address

Unlock Bypass

AAh@ 555h

55h@

AAAh

20h@

555h

Unlock Bypass

Program(9)

A0h@

XXXh

PD@ PA

Unlock Bypass

Reset(10)

90h@ XXXh

00h@

XXXh

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