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PIC16F871T Datasheet(PDF) 11 Page - Microchip Technology |
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PIC16F871T Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 172 page  2000-2013 Microchip Technology Inc. DS30569C-page 11 PIC16F870/871 2.0 MEMORY ORGANIZATION The PIC16F870/871 devices have three memory blocks. The Program Memory and Data Memory have separate buses, so that concurrent access can occur, and is detailed in this section. The EEPROM data memory block is detailed in Section 3.0. Additional information on device memory may be found in the PICmicroTM Mid-Range MCU Family Reference Manual (DS33023). 2.1 Program Memory Organization The PIC16F870/871 devices have a 13-bit program counter capable of addressing an 8K x 14 program memory space. The PIC16F870/871 devices have 2K x 14 words of FLASH program memory. Accessing a location above the physically implemented address will cause a wraparound. The RESET vector is at 0000h and the interrupt vector is at 0004h. FIGURE 2-1: PIC16F870/871 PROGRAM MEMORY MAP AND STACK 2.2 Data Memory Organization The data memory is partitioned into multiple banks which contain the General Purpose Registers and the Special Function Registers. Bits RP1 (STATUS<6>) and RP0 (STATUS<5>) are the bank select bits. Each bank extends up to 7Fh (128 bytes). The lower locations of each bank are reserved for the Special Function Registers. Above the Special Function Regis- ters are General Purpose Registers, implemented as static RAM. All implemented banks contain Special Function Registers. Some “high use” Special Function Registers from one bank may be mirrored in another bank for code reduction and quicker access. 2.2.1 GENERAL PURPOSE REGISTER FILE The register file can be accessed either directly, or indirectly through the File Select Register FSR. PC<12:0> 13 0000h 0004h 0005h Stack Level 1 Stack Level 8 RESET Vector Interrupt Vector On-Chip CALL, RETURN RETFIE, RETLW 1FFFh Stack Level 2 Program Memory Page 0 07FFh 0800h RP<1:0> Bank 00 0 01 1 10 2 11 3 Note: EEPROM Data Memory description can be found in Section 3.0 of this Data Sheet. |
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