SST89V564RD-33-I-PJ SST [Silicon Storage Technology, Inc], SST89V564RD-33-I-PJ Datasheet - Page 12
SST89V564RD-33-I-PJ
Manufacturer Part Number
SST89V564RD-33-I-PJ
Description
FlashFlex51 MCU
Manufacturer
SST [Silicon Storage Technology, Inc]
Datasheet
1.SST89V564RD-33-I-PJ.pdf
(86 pages)
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Data Sheet
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
TABLE
©2003 Silicon Storage Technology, Inc.
SFCF[1:0]
SFCF[1:0]
FIGURE
01, 10, 11
10, 11
00
01
00
FFFFH
0000H
3-1: SFCF V
3-2: SFCF V
3-2: P
Program Memory Block Switching
Block 1 is not visible to the program counter (PC).
Block 1 is reachable only via in-application programming from 0000H - 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.
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.
EA# = 0
64 KByte
External
ROGRAM
ALUES FOR
ALUES FOR
SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC
M
EMORY
DFFFH
FFFFH
E000H
7FFFH
1FFFH
8000H
2000H
0000H
P
P
ROGRAM
ROGRAM
SFCF[1:0] = 00
O
RGANIZATION FOR
EA# = 1
24 KByte
24 KByte
External
8 KByte
8 KByte
Block 1
Block 0
Block 1
M
M
EMORY
EMORY
B
B
12
LOCK
LOCK
FFFFH
7FFFH
DFFFH
8000H
0000H
E000H
SST89E554RC
S
S
SFCF[1:0] = 01
WITCHING FOR
WITCHING FOR
EA# = 1
24 KByte
32 KByte
External
8 KByte
Block 1
Block 0
AND
SST89E/V564RD
SST89E/V554RC
SST89V554RC
FFFFH
7FFFH
8000H
0000H
SFCF[1:0] = 10, 11
FlashFlex51 MCU
EA# = 1
32 KByte
32 KByte
External
Block 0
1207 F03.2
S71207-04-000
T3-1.1 1207
T3-2.0 1207
12/03
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