sx20ac Parallax, Inc., sx20ac Datasheet - Page 2

• Manufacturer Part Number: sx20ac
• Description: Configurable Communications Controllers With Ee/flash Program Memory, In-system Programming Capability And On-chip Debug
• Manufacturer: Parallax, Inc.

Parallax SX20AC/SX28AC
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© Parallax Inc.
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Product Overview......................................................... 1
Introduction ................................................................................1
Key Features..............................................................................3
Architecture................................................................................4
Programming Benefits in Assembly and High-Level Languages 4
Programming and Debugging Support .......................................4
Applications................................................................................4
Support ......................................................................................4
Part Numbering..........................................................................5
Connection Diagrams .................................................. 6
Pin Assignments ........................................................................6
Pin Descriptions .........................................................................6
Typical Connection Diagrams ....................................................7
Port Descriptions ......................................................... 9
Reading and Writing the Ports ...................................................9
Port Configuration ....................................................................11
Special-Function Registers ....................................... 13
PC Register (02h) ....................................................................13
STATUS Register (03h) ...........................................................13
OPTION Register.....................................................................14
Device Configuration Registers................................ 15
FUSE Word (Read/Program at FFFh in Main Memory Map) ....15
FUSEX Word (Read/Program via Programming Command) ....16
DEVICE Word (Hard-Wired Read-Only)...................................16
Memory Organization ................................................ 17
Program Memory .....................................................................17
Data Memory ...........................................................................17
Power Down Mode ..................................................... 19
Multi-Input Wakeup ..................................................................19
Port B MIWU/Interrupt Configuration........................................20
Interrupt Support........................................................ 21
Oscillator Circuits ...................................................... 23
XT, LP or HS modes ................................................................23
75 MHz Operation....................................................................25
External RC Mode....................................................................25
Internal RC Mode.....................................................................25
Real Time Clock (RTCC)/Watchdog Timer............... 26
RTCC.......................................................................................26
Parallax SX/B Basic Compiler ...............................................................4
Read-Modify-Write Considerations......................................................11
MODE Register ...................................................................................11
Port Configuration Registers ...............................................................11
Port Configuration Upon Reset............................................................12
Program Counter.................................................................................17
Subroutine Stack .................................................................................17
File Select Register (04h)....................................................................17
Table of Contents
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Watchdog Timer ...................................................................... 26
The Prescaler .......................................................................... 26
Comparator .................................................................27
Reset ............................................................................28
Brown-Out Detector ...................................................29
Register States upon Different Reset Operations ...30
Instruction Set ............................................................31
Instruction Set Features........................................................... 31
Instruction Execution ............................................................... 31
Addressing Modes ................................................................... 31
RAM Addressing...................................................................... 32
The Bank Instruction................................................................ 32
Bit Manipulation ....................................................................... 32
Input/Output Operation ............................................................ 32
Increment/Decrement .............................................................. 32
Loop Counting and Data Pointing Testing................................ 32
Branch and Loop Call Instructions ........................................... 32
Return Instructions................................................................... 33
Subroutine Operation............................................................... 33
Comparison and Conditional Branch Instructions .................... 34
Logical Instruction.................................................................... 34
Shift and Rotate Instructions.................................................... 34
Complement and SWAP.......................................................... 34
Native SX Instruction Set Summary Tables .............35
Equivalent Assembler Mnemonics ........................................... 39
Electrical Characteristics...........................................40
Absolute Maximum Ratings ..................................................... 40
DC Characteristics................................................................... 41
AC Characteristics ................................................................... 42
Comparator DC and AC Specifications.................................... 42
Typical Performance Characteristics (25°C) ............................ 43
Package Dimensions..................................................46
SX20AC/SS ............................................................................. 46
SX28AC/SS ............................................................................. 47
SX28AC/DP............................................................................. 48
Manufacturing Information ........................................49
Reflow Peak Temperature ....................................................... 49
MSL3 Compliance ................................................................... 49
Green/RoHS Compliance ........................................................ 49
Stress Testing Data Summary ................................................. 49
Jump Operation .................................................................................. 33
Page Jump Operation......................................................................... 33
Call Operation..................................................................................... 33
Page Call Operation ........................................................................... 33
Push Operation................................................................................... 33
Pop Operation .................................................................................... 34
Rev 1.6 11/20/2006
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