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PIC18F2525 Datasheet(PDF) 55 Page - Microchip Technology |
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PIC18F2525 Datasheet(HTML) 55 Page - Microchip Technology |
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55 / 412 page  © 2008 Microchip Technology Inc. DS39626E-page 53 PIC18F2525/2620/4525/4620 5.0 MEMORY ORGANIZATION There are three types of memory in PIC18 enhanced microcontroller devices: • Program Memory • Data RAM • Data EEPROM As Harvard architecture devices, the data and program memories use separate busses; this allows for con- current access of the two memory spaces. The data EEPROM, for practical purposes, can be regarded as a peripheral device, since it is addressed and accessed through a set of control registers. Additional detailed information on the operation of the Flash program memory is provided in Section 7.0 “Flash Program Memory”. Data EEPROM is discussed separately in Section 6.0 “Data EEPROM Memory”. 5.1 Program Memory Organization PIC18 microcontrollers implement a 21-bit program counter, which is capable of addressing a 2-Mbyte program memory space. Accessing a location between the upper boundary of the physically implemented memory and the 2-Mbyte address will return all ‘0’s (a NOP instruction). The PIC18F2525 and PIC18F4525 each have 48 Kbytes of Flash memory and can store up to 24,576 single-word instructions. The PIC18F2620 and PIC18F4620 each have 64 Kbytes of Flash memory and can store up to 32,768 single-word instructions. PIC18 devices have two interrupt vectors. The Reset vector address is at 0000h and the interrupt vector addresses are at 0008h and 0018h. The program memory maps for PIC18FX525 and PIC18FX620 devices are shown in Figure 5-1. FIGURE 5-1: PROGRAM MEMORY MAP AND STACK FOR PIC18F2525/2620/4525/4620 DEVICES PC<20:0> Stack Level 1 • Stack Level 31 Reset Vector Low-Priority Interrupt Vector • • CALL,RCALL,RETURN RETFIE,RETLW 21 0000h 0018h On-Chip Program Memory High-Priority Interrupt Vector 0008h 1FFFFFh C000h BFFFh Read ‘0’ 200000h PC<20:0> Stack Level 1 • Stack Level 31 Reset Vector Low-Priority Interrupt Vector • • CALL,RCALL,RETURN RETFIE,RETLW 21 0000h 0018h 10000h FFFFh On-Chip Program Memory High-Priority Interrupt Vector 0008h Read ‘0’ 1FFFFFh 200000h PIC18FX525 PIC18FX620 |
Similar Part No. - PIC18F2525_08 |
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Similar Description - PIC18F2525_08 |
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