SST89C54 datasheet(29/50 Pages) SST

29 / 50 page

344-2 8/00

FlashFlex51 MCU

SST89C54 / SST89C58

Preliminary Specifications

Re-Map bits previously in un-programmed state can be

programmed by these commands. The PROG-RB1,

PROG-RB0 sequences are as follows:

Set-Up

MOV SFDT, #55h

Interrupt INT1#

occurrence completion

Polling SFST[2]

indicates completion

Program Re-Map [1]

MOV SFCM, #09h

MOV SFCM, #89h

Program Re-Map [0]

MOV SFCM, #08h

MOV SFCM, #88h

344 ILL F46.4

IAP Enable

Polling

A command that uses the polling method to detect flash

operation completion should poll on the Flash_Busy bit

(SFST[2]). When Flash_Busy de-asserts (logic 0), the

device is ready for the next operation.

The BUSY bit (SFST[3]) is provided for Burst-Program.

In between bytes within a burst sequence, the Busy bit

will become logic 0 to indicate that the next Burst-

Program byte should be presented. Completion of the full

burst cycle is indicated also by Flash_Busy bit (SFST[2]).

MOVC instruction may also be used for verification of the

Programming and Erase operation of the flash memory.

MOVC command will fail if it is directed at a flash block

that is still busy.

SST89C54 Datasheet(PDF) 29 Page - Silicon Storage Technology, Inc