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SST89V52RD2-33-I-TQJ Datasheet(PDF) 35 Page - Silicon Storage Technology, Inc |
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SST89V52RD2-33-I-TQJ Datasheet(HTML) 35 Page - Silicon Storage Technology, Inc |
35 / 81 page Data Sheet FlashFlex51 MCU SST89E52RD2/RD / SST89E54RD2/RD / SST89E58RD2/RD SST89V52RD2/RD / SST89V54RD2/RD / SST89V58RD2/RD 35 ©2006 Silicon Storage Technology, Inc. S71255-05-000 5/06 4.2.4.1 Chip-Erase The Chip-Erase command erases all bytes in both memory blocks. This command is only allowed when EA#=0 (exter- nal memory execution). Additionally this command is not permitted when the device is in level 4 locking. In all other instances, this command ignores the Security Lock status and will erase the security lock bits and re-map bits. FIGURE 4-1: Chip-Erase 4.2.4.2 Block-Erase The Block-Erase command erases all bytes in one of the two memory blocks (Block 0 or Block 1). The selection of the memory block to be erased is determined by the (SFAH[7]) of the SuperFlash Address Register. For SST89x5xRD2/RD, if SFAH[7] = 0b, the primary flash memory Block 0 is selected. If SFAH[7:4] = EH, the sec- ondary flash memory Block 1 is selected. The Block-Erase command sequence for SST89x5xRD2/RD is as follows: FIGURE 4-2: Block-Erase 4.2.4.3 Sector-Erase The Sector-Erase command erases all of the bytes in a sector. The sector size for the flash memory blocks is 128 Bytes. The selection of the sector to be erased is deter- mined by the contents of SFAH and SFAL. FIGURE 4-3: Sector-Erase Set-Up MOV SFDT, #55H Interrupt scheme MOV SFCM, #81H Polling scheme MOV SFCM, #01H INT1 interrupt indicates completion SFST[2] indicates operation completion IAP Enable ORL SFCF, #40H 1255 F08.0 Set-Up MOV SFDT, #55H IAP Enable ORL SFCF, #40H OR Interrupt scheme MOV SFCM, #8DH Polling scheme MOV SFCM, #0DH Erase Block 1 MOV SFAH, #F0H Erase Block 0 MOV SFAH, #00H INT1 interrupt indicates completion SFST[2] indicates operation completion 1255 F09.0 Program sector address MOV SFAH, #sector_addressH MOV SFAL, #sector_addressL Interrupt scheme MOV SFCM, #8BH Polling scheme MOV SFCM, #0BH INT1 interrupt indicates completion SFST[2] indicates operation completion 1255 F10.0 IAP Enable ORL SFCF, #40H |
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