SST89C54-33-I-PI View Datasheet(PDF) - Silicon Storage Technology
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SST89C54-33-I-PI Datasheet PDF : 50 Pages
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FlashFlex51 MCU
SST89C54 / SST89C58
Preliminary Specifications
IAP Enable
Erase 32 KBlock
Erase 4 KBlock
MOV SFAH, #00h
OR
MOV SFAH, #F0h
Set-Up
MOV SFDT, #55h
Polling scheme
MOV SFCM, #0Dh
SFST[2] indicates
operation completion
Interrupt scheme
MOV SFCM, #8Dh
INT1# occurrence
indicates completion
344 ILL F40.5
The 16/32 KByte memory contains 128/256 uniform
sectors of 128 Bytes each. The 4 KByte memory contains
64 uniform sectors of 64 Bytes each. The selection of the
sector to be erased is determined by the contents of
1
SFAH, SFAL. Please refer to Figure 4 for an illustration
of memory sector organization.
2
The BYTE-PROGRAM command programs data into a
single byte. The BYTE-PROGRAM command sequence
is as follows:
3
4
IAP Enable
5
Program byte address
MOV SFAH, #byte_addressh
MOV SFAL, #byte_addressl
6
Move data to SFDT
7
MOV SFDT, #data
The SECTOR-ERASE command erases all of the bytes
in a sector. The sector size for the primary flash memory
Block 0 (Addresses 0000h-3FFFh/7FFFh) is 128 Bytes.
The sector size for the secondary flash memory Block 1
(Address F000h-FFFFh) is 64 Bytes. The SECTOR-
ERASE command sequence is as follows:
IAP Enable
Polling scheme
MOV SFCM, #0Eh
SFST[2] indicates
operation completion
8
Interrupt scheme
MOV SFCM, #8Eh
9
INT1# occurrence
indicates completion
10
344 ILL F42.3
11
Program sector address
MOV SFAH, #sector_addressh
MOV SFAL, #sector_addressl
Polling scheme
MOV SFCM, #0Bh
Interrupt scheme
MOV SFCM, #8Bh
The BURST-PROGRAM command programs data into
half of a sector (row) which has the same row address, 12
sequentially byte-by-byte. Refer to the Memory Organi-
zation section and Figures 4 and 15 for details. The
MOVC command and all IAP commands except BURST- 13
PROGRAM are invalid during the BURST-PROGRAM
cycle. The BURST-PROGRAM command sequence is
as follows:
14
SFST[2] indicates
INT1# occurrence
15
operation completion
indicates completion
344 ILL F41.3
16
© 2000 Silicon Storage Technology, Inc.
27
344-2 8/00
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