SST89E554RC View Datasheet(PDF) - Silicon Storage Technology
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SST89E554RC Datasheet PDF : 62 Pages
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FlashFlex51 MCU
SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC
Preliminary Specifications
FFFFH
EA# = 0
EA# = 1
EA# = 1
SFCF[1:0] = 00
SFCF[1:0] = 01
FFFFH
FFFFH
EA# = 1
SFCF[1:0] = 10, 11
FFFFH
External
64 KByte
E000H
DFFFH
8000H
7FFFH
8 KByte
Block 1
External
24 KByte
24 KByte
Block 0
E000H
DFFFH
8000H
7FFFH
8 KByte
Block 1
External
24 KByte
External
32 KByte
8000H
7FFFH
2000H
1FFFH
8 KByte
Block 1
32 KByte
Block 0
32 KByte
Block 0
0000H
0000H
0000H
0000H
555 ILL F03.2
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.
TABLE 3-1: SFCF VALUES FOR PROGRAM MEMORY BLOCK SWITCHING FOR SST89E564RD/SST89V564RD
SFCF[1:0]
01, 10, 11
00
Program Memory Block Switching
Block 1 is not visible to the PC;
Block 1 is reachable only via In-Application Programming from 000H - 1FFFH.
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
©2001 Silicon Storage Technology, Inc.
11
S71207-00-000 9/01 555
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