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SST89C54-33-AC-NI 데이터시트(PDF) 8 Page - Silicon Storage Technology, Inc

부품명 SST89C54-33-AC-NI
상세설명  FlashFlex51 MCU
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제조업체  SST [Silicon Storage Technology, Inc]
홈페이지  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

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© 2000 Silicon Storage Technology, Inc.
344-2 8/00
FlashFlex51 MCU
SST89C54 / SST89C58
Preliminary Specifications
MEMORY ORGANIZATION
The SST89C54/58 have separate address spaces for
program and data memory.
Program Memory
There are two internal flash memory blocks in the
SST89C54/58. The primary flash memory Block 0 has
16/32 KByte and occupies the address space 0000h to
3FFFh/7FFFh. The secondary flash memory Block 1 has
4 KByte and occupies the address space F000h to
FFFFh.
The 16/32K x8 primary SuperFlash block is organized as
128/256 uniform sectors with sector address from A15 to
A7. Each sector contains 2 rows with row address from
A15 to A6. Each row has 64 Bytes with byte address from
A5 to A0.
FIGURE 4: SECTOR ORGANIZATION
The 4K x8 secondary SuperFlash block is organized as
64 uniform sectors with sector address from A15 to A6.
Each sector contains 2 rows with row address from A15
to A5. Each row contains 32 Bytes with byte address
from A4 to A0. Figure 4 shows the sector organization for
SST89C54/58.
When internal code operation is enabled (EA# = 1), the
primary 16/32 KByte flash memory block is always
visible to the program counter for code fetching. Figures
5 and 6 show the program memory organizations for the
SST89C54/58.
When internal code operation is enabled (EA# = 1), the
secondary 4 KByte flash memory block is selectively
visible for code fetching. The secondary block is always
accessible through the SuperFlash mailbox registers:
SFCM, SFCF, SFAL, SFAH, SFDT and SFST. When bit
7 of the SuperFlash Configuration mailbox register
(SFCF[7]), SFR address location B1h, is set, the second-
ary 4 KByte block will be visible by program counter.
7FFFh
7F80h
4000h
3FFFh
0000h
Block 0 (16/32 KByte)
344 ILL F47.6
Sector 255
Sector 127
Sector 0
3F80h
007Fh
FFFFh
FFC0h
F03Fh
Block 1 (4 KByte)
Primary
Secondary
Sector 63
Sector 0
F000h
89C58
89C54


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