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SST89V554RC-25-I-PJ Datasheet(PDF) 11 Page - Silicon Storage Technology, Inc

Part # SST89V554RC-25-I-PJ
Description  FlashFlex51 MCU
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Manufacturer  SST [Silicon Storage Technology, Inc]
Direct Link  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST89V554RC-25-I-PJ Datasheet(HTML) 11 Page - Silicon Storage Technology, Inc

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Preliminary Specifications
FlashFlex51 MCU
SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC
11
©2001 Silicon Storage Technology, Inc.
S71207-00-000
9/01
555
FIGURE
3-2: PROGRAM MEMORY ORGANIZATION FOR SST89E554RC AND SST89V554RC
3.2 Program Memory Block Switching
The program memory block switching feature of the device
allows either Block 1 or the lowest 8 KByte of Block 0 to be
used for the lowest 8 KByte of the program address space.
SFCF[1:0] controls program memory block switching.
555 ILL F03.2
External
64 KByte
EA# = 0
FFFFH
0000H
32 KByte
Block 0
EA# = 1
SFCF[1:0] = 10, 11
FFFFH
0000H
24 KByte
Block 0
8 KByte
Block 1
8 KByte
Block 1
EA# = 1
SFCF[1:0] = 00
FFFFH
2000H
7FFFH
8000H
DFFFH
E000H
DFFFH
E000H
7FFFH
8000H
0000H
1FFFH
External
24 KByte
8 KByte
Block 1
External
24 KByte
External
32 KByte
EA# = 1
SFCF[1:0] = 01
FFFFH
7FFFH
8000H
0000H
32 KByte
Block 0
TABLE
3-1: SFCF VALUES FOR PROGRAM MEMORY BLOCK SWITCHING FOR SST89E564RD/SST89V564RD
SFCF[1:0]
Program Memory Block Switching
01, 10, 11
Block 1 is not visible to the PC;
Block 1 is reachable only via In-Application Programming from 000H - 1FFFH.
00
Block 1 is overlaid onto the low 8K of the program address space; occupying address locations 0000H - 1FFFH.
When the PC falls within 0000H - 1FFFH, the instruction will be fetched from Block 1 instead of Block 0.
Outside of 0000H - 1FFFH, Block 0 is used. Locations 0000H - 1FFFH of Block 0 are reachable through
In-Application Programming.
T3-1.0 555


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