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CONTENTS
4.5.1 Using Registers .......................................................................................................4-12
4.5.2 Addressing 32-bit Operands ...................................................................................4-12
4.5.3 Addressing 64-bit Operands ...................................................................................4-12
4.5.4 Linking Subroutines ................................................................................................4-13
4.6 SOFTWARE PROTECTION FEATURES AND GUIDELINES .................................... 4-14
CHAPTER 5
MEMORY PARTITIONS
5.1 MEMORY MAP OVERVIEW.......................................................................................... 5-1
5.2 MEMORY PARTITIONS ................................................................................................ 5-3
5.2.1 External Memory .......................................................................................................5-5
5.2.2 Program and Special-purpose Memory ....................................................................5-5
5.2.2.1 Program Memory in Page FFH ............................................................................5-5
5.2.2.2 Special-purpose Memory .....................................................................................5-6
5.2.2.3 Reserved Memory Locations ...............................................................................5-7
5.2.2.4 Interrupt and PTS Vectors ....................................................................................5-7
5.2.2.5 Chip Configuration Bytes .....................................................................................5-7
5.2.3 Peripheral Special-function Registers (SFRs) ...........................................................5-7
5.2.4 Register File ..............................................................................................................5-9
5.2.4.1 General-purpose Register RAM .........................................................................5-11
5.2.4.2 Stack Pointer (SP) ..............................................................................................5-11
5.2.4.3 CPU Special-function Registers (SFRs) .............................................................5-12
5.3 WINDOWING............................................................................................................... 5-13
5.3.1 Selecting a Window ................................................................................................5-14
5.3.2 Addressing a Location Through a Window .............................................................5-16
5.3.2.1 32-byte Windowing Example ..............................................................................5-18
5.3.2.2 64-byte Windowing Example ..............................................................................5-18
5.3.2.3 128-byte Windowing Example ............................................................................5-18
5.3.2.4 Unsupported Locations Windowing Example (8XC196NP Only) .......................5-19
5.3.2.5 Using the Linker Locator to Set Up a Window ....................................................5-19
5.3.3 Windowing and Addressing Modes .........................................................................5-21
5.4 REMAPPING INTERNAL ROM (83C196NP ONLY) ................................................... 5-22
5.5 FETCHING CODE AND DATA IN THE 1-MBYTE AND 64-KBYTE MODES.............. 5-23
5.5.1 Fetching Instructions ...............................................................................................5-23
5.5.2 Accessing Data .......................................................................................................5-23
5.5.3 Code Fetches in the 1-Mbyte Mode ........................................................................5-25
5.5.4 Code Fetches in the 64-Kbyte Mode ......................................................................5-25
5.5.5 Data Fetches in the 1-Mbyte and 64-Kbyte Modes .................................................5-26
5.6 MEMORY CONFIGURATION EXAMPLES ................................................................. 5-27
5.6.1 Example 1: Using the 64-Kbyte Mode ....................................................................5-27
5.6.2 Example 2: A 64-Kbyte System with Additional Data Storage ................................5-29
5.6.3 Example 3: Using 1-Mbyte Mode ............................................................................5-31