SST89E58RD2A(2011) View Datasheet(PDF) - Silicon Storage Technology
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Description
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SST89E58RD2A Datasheet PDF : 91 Pages
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A Microchip Technology Company
FlashFlex MCU
SST89E54RD2A/RDA / SST89E58RD2A/RDA
Not Recommended for New Designs
FFFFH
EA# = 0
FFFFH
E000H
DFFFH
EA# = 1
SFCF[1:0] = 00
8 KByte
Block 1
External
24 KByte
FFFFH
E000H
DFFFH
EA# = 1
SFCF[1:0] = 01
8 KByte
Block 1
External
24 KByte
EA# = 1
SFCF[1:0] = 10, 11
FFFFH
External
32 KByte
External
64 KByte
8000H
7FFFH
8000H
7FFFH
8000H
7FFFH
0000H
24 KByte
Block 0
2000H
1FFFH
0000H
8 KByte
Block 1
32 KByte
Block 0
0000H
0000H
Figure 6: Program Memory Organization for 32 KByte SST89E58RDxA
32 KByte
Block 0
1339 F03.0
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 pro-
gram memory block switching.
Table 2: SFCF Values for Program Memory Block Switching
SFCF[1:0]
10, 11
01
00
Program Memory Block Switching
Block 1 is not visible to the PC;
Block 1 is reachable only via in-application programming from E000H - FFFFH.
Both Block 0 and Block 1 are visible to the PC.
Block 0 is occupied from 0000H - 7FFFH. Block 1 is occupied from E000H - FFFFH.
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.
T0-0.0 25114
©2011 Silicon Storage Technology, Inc.
11
DS25114A
12/11
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