PSD4235G2 datasheet(20/93 Pages) STMICROELECTRONICS

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Preliminary Information

PSD4000 Series

FS0-7

Instruction

(Note 14)

CSBOOT0-3 Cycle 1 Cycle 2 Cycle 3

Cycle 4

Cycle5

Cycle 6

Cycle 7

Read (Note 5)

“Read”

RA RD

Read Main Flash ID

AAh

55h

90h

“Read”

(Note 6)

@XAAAh @X554h @XAAAh

@XX02h

Read Sector Protection

AAh

55h

90h

“Read”

(Notes 6,8,13)

@XAAAh @X554h @XAAAh 00h or 01h

@XX04h

Program a Flash Word

AAh

55h

A0h

PD@PA

@XAAAh @X554h @XAAAh

Erase One Flash Sector

AAh

55h

80h

AAh

55h

30h

@XAAAh @X554h @XAAAh

@XAAAh

@X554h

@SA

@next SA

(Note 7)

Erase Flash Block

AAh

55h

80h

AAh

55h

10h

(Bulk Erase)

@XAAAh @X554h @XAAAh

@XAAAh

@X554h

@XAAAh

Suspend Sector Erase

B0h

(Note 11)

@xxxh

Resume Sector Erase

30h

(Note 12)

@xxxh

Reset (Note 6)

F0 @ any

address

Unlock Bypass

AAh

55h

20h

@XAAAh @X554h @XAAAh

Unlock Bypass Program

A0h

PD@PA

(Note 9)

@XXXXh

Unlock Bypass Reset

90h

00h

(Note 10)

@XXXXh @XXXXh

Table 8. Instructions

= Don’t Care. “xxxh” address in the above table must be an even address.

RA = Address of the memory location to be read.

RD = Data read from location RA during read operation.

PA = Address of the memory location to be programmed. Addresses are latched on the falling edge of the WR#

(CNTL0) pulse. PA is an even address for PSD in word programming mode.

PD = Data (word) to be programmed at location PA. Data is latched on the rising edge of WR# (CNTL0) pulse.

SA = Address of the sector to be erased or verified. The chip select (FS0-7 or CSBOOT0-3) of the sector to be

erased must be active (high).

NOTES:

All bus cycles are write bus cycle except the ones with the “read” label.

All values are in hexadecimal.

FS0-7 and CSBOOT0-3 are active high and are defined in PSDsoft.

Only Address bits A11-A0 are used in Instruction decoding.

No unlock or command cycles required when device is in read mode.

The Reset command is required to return to the read mode after reading the Flash ID, Sector Protect status

or if DQ5 (DQ13) goes high.

Additional sectors to be erased must be entered within 80µs.

The data is 00h for an unprotected sector and 01h for a protected sector. In the fourth cycle, the sector chip

select is active and (A1 = 1, A0 = 0).

The Unlock Bypass command is required prior to the Unlock Bypass Program command.

10. The Unlock Bypass Reset command is required to return to reading array data when the device is in the

Unlock Bypass mode.

11. The system may read and program functions in non-erasing sectors, read the Flash ID or read the Sector

Protect status, when in the Erase Suspend mode. The erase Suspend command is valid only during a sector

erase operation.

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

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

instruction is intended. The MCU must fetch, for example, codes from the Secondary Flash memory when

reading the Sector Protection Status of the main Flash.

14. All write bus cycles in an instruction are byte write to even address (XA4Ah or X554h). Flash Programming

bys cycle is writing a word to even address.

The

PSD4000

Functional

Blocks

(cont.)

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