SST89E554 Просмотр технического описания (PDF) - Silicon Storage Technology

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SST89E554

Flash flex 51 MCU

Silicon Storage Technology 

FlashFlex51 MCU

SST89E564 / SST89V564 / SST89E554 / SST89V554

Preliminary Specifications

FFFFH

EA# = 0

External

64 KByte

0000H

EA# = 1

EA# = 1

SFCF[1:0] = 00

SFCF[1:0] = 01

FFFFH

FFFFH

EA# = 1

SFCF[1:0] = 10, 11

FFFFH

E000H

DFFFH

8000H

7FFFH

2000H

1FFFH

0000H

8 KByte

Block 1

External

24 KByte

24 KByte

Block 0

8 KByte

Block 1

E000H

DFFFH

8000H

7FFFH

8 KByte

Block 1

External

24 KByte

32 KByte

Block 0

0000H

External

32 KByte

8000H

7FFFH

32 KByte

Block 0

0000H

384 ILL F48b.3

FIGURE 3-2: PROGRAM MEMORY ORGANIZATION FOR SST89E554 AND SST89V554

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 SST89E564/SST89V564

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.

T3-1.0 384

©2001 Silicon Storage Technology, Inc.

11

S71181-03-000 9/01 384

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