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48GA004 Datasheet(PDF) 31 Page - Microchip Technology |
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48GA004 Datasheet(HTML) 31 Page - Microchip Technology |
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31 / 268 page  2010 Microchip Technology Inc. DS39881D-page 31 PIC24FJ64GA004 FAMILY 4.0 MEMORY ORGANIZATION As Harvard architecture devices, PIC24F micro- controllers feature separate program and data memory spaces and busses. This architecture also allows the direct access of program memory from the data space during code execution. 4.1 Program Address Space The program address memory space of the PIC24FJ64GA004 family devices is 4M instructions. The space is addressable by a 24-bit value derived from either the 23-bit Program Counter (PC) during pro- gram execution, or from table operation or data space remapping, as described in Section 4.3 “Interfacing Program and Data Memory Spaces” . User access to the program memory space is restricted to the lower half of the address range (000000h to 7FFFFFh). The exception is the use of TBLRD/TBLWT operations which use TBLPAG<7> to permit access to the Configuration bits and Device ID sections of the configuration memory space. Memory maps for the PIC24FJ64GA004 family of devices are shown in Figure 4-1. FIGURE 4-1: PROGRAM SPACE MEMORY MAP FOR PIC24FJ64GA004 FAMILY DEVICES 000000h 0000FEh 000002h 000100h F8000Eh F80010h FEFFFEh FFFFFFh 000004h 000200h 0001FEh 000104h Reset Address User Flash Program Memory (11K instructions) DEVID (2) GOTO Instruction Reserved Alternate Vector Table Reserved Interrupt Vector Table PIC24FJ32GA Flash Config Words Note: Memory areas are not shown to scale. Reset Address Device Config Registers DEVID (2) GOTO Instruction Reserved Alternate Vector Table Reserved Interrupt Vector Table PIC24FJ48GA FF0000h F7FFFEh F80000h Device Config Registers 800000h 7FFFFFh Reserved Reserved Flash Config Words 00AC00h 00ABFEh Unimplemented Read ‘0’ Unimplemented Read ‘0’ Reset Address Device Config Registers User Flash Program Memory (22K instructions) DEVID (2) GOTO Instruction Reserved Alternate Vector Table Reserved Interrupt Vector Table PIC24FJ64GA Reserved Flash Config Words Unimplemented Read ‘0’ Reset Address DEVID (2) GOTO Instruction Reserved Alternate Vector Table Reserved Interrupt Vector Table PIC24FJ16GA Flash Config Words Device Config Registers Reserved Unimplemented Read ‘0’ 005800h 0057FEh 002C00h 002BFEh User Flash Program Memory (5.5K instructions) 008400h 0083FEh User Flash Program Memory (16K instructions) |
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