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PIC876 数据表(PDF) 13 Page - Microchip Technology |
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PIC876 数据表(HTML) 13 Page - Microchip Technology |
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13 / 218 page ![]() 2001 Microchip Technology Inc. DS30292C-page 11 PIC16F87X 2.0 MEMORY ORGANIZATION There are three memory blocks in each of the PIC16F87X MCUs. 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 4.0. Additional information on device memory may be found in the PICmicro Mid-Range Reference Manual, (DS33023). FIGURE 2-1: PIC16F877/876 PROGRAM MEMORY MAP AND STACK 2.1 Program Memory Organization The PIC16F87X devices have a 13-bit program counter capable of addressing an 8K x 14 program memory space. The PIC16F877/876 devices have 8K x 14 words of FLASH program memory, and the PIC16F873/874 devices have 4K x 14. 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 2-2: PIC16F874/873 PROGRAM MEMORY MAP AND STACK 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 Page 1 Page 2 Page 3 07FFh 0800h 0FFFh 1000h 17FFh 1800h 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 Page 1 07FFh 0800h 0FFFh 1000h |
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