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© 2000 Silicon Storage Technology, Inc.

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FlashFlex51 MCU

SST89C54 / SST89C58

Preliminary Specifications

TABLE OF CONTENTS

PRODUCT FEATURES ......................................................................................................................................... 1

PRODUCT DESCRIPTION .................................................................................................................................... 1

FUNCTIONAL BLOCKS ......................................................................................................................................... 4

Functional Block Diagram ............................................................................................................................... 4

PIN ASSIGNMENTS .............................................................................................................................................. 5

Pin Descriptions .............................................................................................................................................. 6

MEMORY ORGANIZATION ................................................................................................................................... 8

Program Memory ............................................................................................................................................ 8

Memory Re-Mapping ..................................................................................................................................... 10

Activation and Deactivation of Memory Re-Mapping ............................................................................... 11

Data Memory ................................................................................................................................................ 13

Special Function Registers (SFR) ................................................................................................................. 13

CPU Related SFRs .................................................................................................................................. 13

Flash Memory Programming SFRs .......................................................................................................... 14

Watchdog Timer SFRs ............................................................................................................................ 17

Timer/Counters SFRs .............................................................................................................................. 18

Interface SFRs ......................................................................................................................................... 18

FLASH MEMORY PROGRAMMING .................................................................................................................... 18

External Host Programming Mode ................................................................................................................ 18

Product Identification ............................................................................................................................... 20

External Host Mode Commands .............................................................................................................. 20

External Host Mode Clock Source ........................................................................................................... 21

Arming Command .................................................................................................................................... 21

Programming a SST89C54/58 ................................................................................................................. 21

Flash Operation Status Detection (Ext. Host Handshake) ....................................................................... 22

In-Application Programming Mode ................................................................................................................ 26

In-Application Programming Mode Clock Source ..................................................................................... 26

IAP Enable Bit ......................................................................................................................................... 26

In-Application Programming Mode Commands ........................................................................................26

Polling ...................................................................................................................................................... 29

Interrupt Temination ................................................................................................................................. 30

TIMERS/COUNTERS ........................................................................................................................................... 31