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SST89E554RC-33-I-PI Datasheet(PDF) 12 Page - Silicon Storage Technology, Inc |
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SST89E554RC-33-I-PI Datasheet(HTML) 12 Page - Silicon Storage Technology, Inc |
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12 / 86 page  12 Data Sheet FlashFlex51 MCU SST89E564RD / SST89V564RD / SST89E554RC / SST89V554RC ©2003 Silicon Storage Technology, Inc. S71207-04-000 12/03 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. 1207 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 SST89E/V564RD SFCF[1:0] Program Memory Block Switching 01, 10, 11 Block 1 is not visible to the program counter (PC). Block 1 is reachable only via in-application programming from 0000H - 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. T3-1.1 1207 TABLE 3-2: SFCF VALUES FOR PROGRAM MEMORY BLOCK SWITCHING FOR SST89E/V554RC SFCF[1:0] Program Memory Block Switching 10, 11 Block 1 is not visible to the PC; Block 1 is reachable only via in-application programming from E000H - FFFFH. 01 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. 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. T3-2.0 1207 |
Número de pieza similar - SST89E554RC-33-I-PI |
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Descripción similar - SST89E554RC-33-I-PI |
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