SST89C54-33-I-PI View Datasheet(PDF) - Silicon Storage Technology

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SST89C54-33-I-PI

FlashFlex51 MCU

Silicon Storage Technology 

MEMORY ORGANIZATION

The SST89C54/58 have separate address spaces for

program and data memory.

Program Memory

There are two internal flash memory blocks in the

SST89C54/58. The primary flash memory Block 0 has

16/32 KByte and occupies the address space 0000h to

3FFFh/7FFFh. The secondary flash memory Block 1 has

4 KByte and occupies the address space F000h to

FFFFh.

The 16/32K x8 primary SuperFlash block is organized as

128/256 uniform sectors with sector address from A15 to

A7. Each sector contains 2 rows with row address from

A15 to A6. Each row has 64 Bytes with byte address from

A5 to A0.

FlashFlex51 MCU

SST89C54 / SST89C58

Preliminary Specifications

The 4K x8 secondary SuperFlash block is organized as

64 uniform sectors with sector address from A15 to A6.

Each sector contains 2 rows with row address from A15

to A5. Each row contains 32 Bytes with byte address

from A4 to A0. Figure 4 shows the sector organization for

SST89C54/58.

When internal code operation is enabled (EA# = 1), the

primary 16/32 KByte flash memory block is always

visible to the program counter for code fetching. Figures

5 and 6 show the program memory organizations for the

SST89C54/58.

When internal code operation is enabled (EA# = 1), the

secondary 4 KByte flash memory block is selectively

visible for code fetching. The secondary block is always

accessible through the SuperFlash mailbox registers:

SFCM, SFCF, SFAL, SFAH, SFDT and SFST. When bit

7 of the SuperFlash Configuration mailbox register

(SFCF[7]), SFR address location B1h, is set, the second-

ary 4 KByte block will be visible by program counter.

7FFFh

7F80h

Sector 255

89C58

4000h

3FFFh

3F80h

89C54

Sector 127

007Fh

0000h

Sector 0

Block 0 (16/32 KByte)

Primary

FIGURE 4: SECTOR ORGANIZATION

FFFFh

FFC0h

Sector 63

F03Fh

F000h

Sector 0

Block 1 (4 KByte)

Secondary

344 ILL F47.6

© 2000 Silicon Storage Technology, Inc.

8

344-2 8/00

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