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SN8P2501D

SONiX 8-Bit Micro-Controller

Sonix Technology Co., Ltd 

SN8P2501D

8-Bit Micro-Controller

Table of Content

AMENDENT HISTORY................................................................................................................................ 2

11 PRODUCT OVERVIEW......................................................................................................................... 6

1.1 FEATURES ........................................................................................................................................ 6

1.2 SYSTEM BLOCK DIAGRAM .......................................................................................................... 7

1.3 PIN ASSIGNMENT ........................................................................................................................... 7

1.4 PIN DESCRIPTIONS......................................................................................................................... 8

1.5 PIN CIRCUIT DIAGRAMS............................................................................................................... 9

22 CENTRAL PROCESSOR UNIT (CPU) .............................................................................................. 10

2.1 PROGRAM MEMORY (ROM) ....................................................................................................... 10

2.1.1 RESET VECTOR (0000H) ...................................................................................................... 11

2.1.2 INTERRUPT VECTOR (0008H)............................................................................................. 12

2.1.3 LOOK-UP TABLE DESCRIPTION........................................................................................ 14

2.1.4 JUMP TABLE DESCRIPTION ............................................................................................... 16

2.1.5 CHECKSUM CALCULATION............................................................................................... 18

2.2 DATA MEMORY (RAM)................................................................................................................ 19

2.2.1 SYSTEM REGISTER .............................................................................................................. 19

2.2.1.1 SYSTEM REGISTER TABLE ............................................................................................ 19

2.2.1.2 SYSTEM REGISTER DESCRIPTION ............................................................................... 19

2.2.1.3 BIT DEFINITION of SYSTEM REGISTER ....................................................................... 20

2.2.2 ACCUMULATOR ................................................................................................................... 21

2.2.3 PROGRAM FLAG ................................................................................................................... 22

2.2.4 PROGRAM COUNTER........................................................................................................... 23

2.2.5 Y, Z REGISTERS..................................................................................................................... 25

2.2.6 R REGISTER ........................................................................................................................... 25

2.3 ADDRESSING MODE .................................................................................................................... 26

2.3.1 IMMEDIATE ADDRESSING MODE .................................................................................... 26

2.3.2 DIRECTLY ADDRESSING MODE ....................................................................................... 26

2.3.3 INDIRECTLY ADDRESSING MODE ................................................................................... 26

2.4 STACK OPERATION...................................................................................................................... 27

2.4.1 OVERVIEW ............................................................................................................................. 27

2.4.2 STACK REGISTERS............................................................................................................... 27

2.4.3 STACK OPERATION EXAMPLE.......................................................................................... 28

2.5 CODE OPTION TABLE .................................................................................................................. 29

2.5.1 Fcpu code option ...................................................................................................................... 29

2.5.2 Reset_Pin code option .............................................................................................................. 29

2.5.3 Security code option ................................................................................................................. 29

2.5.4 Noise Filter code option ........................................................................................................... 29

33 RESET ..................................................................................................................................................... 30

3.1 OVERVIEW ..................................................................................................................................... 30

3.2 POWER ON RESET......................................................................................................................... 31

3.3 WATCHDOG RESET ...................................................................................................................... 31

3.4 BROWN OUT RESET ..................................................................................................................... 31

3.5 THE SYSTEM OPERATING VOLTAGE....................................................................................... 32

3.6 LOW VOLTAGE DETECTOR (LVD) ............................................................................................ 32

3.7 BROWN OUT RESET IMPROVEMENT ....................................................................................... 34

3.8 EXTERNAL RESET ........................................................................................................................ 35

3.9 EXTERNAL RESET CIRCUIT ....................................................................................................... 35

3.9.1 Simply RC Reset Circuit .......................................................................................................... 35

SONiX TECHNOLOGY CO., LTD

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Version 1.2

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