SN8F2255B datasheet(3/133 Pages) SONIX

3 / 133 page

SN8F2250B Series

USB 2.0 Full-Speed 8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 3

Version 1.1

Table of Content

AMENDMENT HISTORY .............................................................................................................. 2

PRODUCT OVERVIEW ............................................................................................................ 7

1.1 FEATURES ............................................................................................................................. 7

1.2 SYSTEM BLOCK DIAGRAM ................................................................................................... 8

1.3 PIN ASSIGNMENT.................................................................................................................. 9

1.4 PIN DESCRIPTIONS............................................................................................................. 11

1.5 PIN CIRCUIT DIAGRAMS ..................................................................................................... 12

CENTRAL PROCESSOR UNIT (CPU) ................................................................................... 13

2.1 MEMORY MAP ..................................................................................................................... 13

2.1.1 PROGRAM MEMORY (ROM) ........................................................................................ 13

2.1.1.1 RESET VECTOR (0000H) ....................................................................................... 14

2.1.1.2 INTERRUPT VECTOR (0008H)............................................................................... 15

2.1.1.3 LOOK-UP TABLE DESCRIPTION ........................................................................... 17

2.1.1.4 JUMP TABLE DESCRIPTION ................................................................................. 19

2.1.1.5 CHECKSUM CALCULATION .................................................................................. 21

2.1.2 CODE OPTION TABLE .................................................................................................. 22

2.1.3 DATA MEMORY (RAM) ................................................................................................. 23

2.1.4 SYSTEM REGISTER ..................................................................................................... 24

2.1.4.1 SYSTEM REGISTER TABLE................................................................................... 24

2.1.4.2 SYSTEM REGISTER DESCRIPTION ..................................................................... 24

2.1.4.3 BIT DEFINITION of SYSTEM REGISTER ............................................................... 25

2.1.4.4 ACCUMULATOR ..................................................................................................... 27

2.1.4.5 PROGRAM FLAG .................................................................................................... 28

2.1.4.6 PROGRAM COUNTER............................................................................................ 29

2.1.4.7 Y, Z REGISTERS..................................................................................................... 32

2.1.4.8 R REGISTERS......................................................................................................... 33

2.2 ADDRESSING MODE ........................................................................................................... 34

2.2.1 IMMEDIATE ADDRESSING MODE ............................................................................... 34

2.2.2 DIRECTLY ADDRESSING MODE ................................................................................. 34

2.2.3 INDIRECTLY ADDRESSING MODE.............................................................................. 34

2.3 STACK OPERATION ............................................................................................................ 35

2.3.1 OVERVIEW .................................................................................................................... 35

2.3.2 STACK REGISTERS...................................................................................................... 36

2.3.3 STACK OPERATION EXAMPLE.................................................................................... 37

RESET .................................................................................................................................... 38

3.1 OVERVIEW........................................................................................................................... 38

3.2 POWER ON RESET.............................................................................................................. 39

3.3 WATCHDOG RESET ............................................................................................................ 39

3.4 BROWN OUT RESET ........................................................................................................... 40

3.4.1 BROWN OUT DESCRIPTION........................................................................................ 40

3.4.2 THE SYSTEM OPERATING VOLTAGE DECSRIPTION ............................................... 41

3.4.3 BROWN OUT RESET IMPROVEMENT......................................................................... 42

3.5 EXTERNAL RESET............................................................................................................... 43

3.6 EXTERNAL RESET CIRCUIT ............................................................................................... 43

3.6.1 Simply RC Reset Circuit ................................................................................................. 43

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