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PIC16F819 Datasheet(PDF) 11 Page - Microchip Technology |
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PIC16F819 Datasheet(HTML) 11 Page - Microchip Technology |
11 / 176 page 2004 Microchip Technology Inc. DS39598E-page 9 PIC16F818/819 2.0 MEMORY ORGANIZATION There are two memory blocks in the PIC16F818/819. These are the program memory and the data memory. Each block has its own bus, so access to each block can occur during the same oscillator cycle. The data memory can be further broken down into the general purpose RAM and the Special Function Registers (SFRs). The operation of the SFRs that control the “core” are described here. The SFRs used to control the peripheral modules are described in the section discussing each individual peripheral module. The data memory area also contains the data EEPROM memory. This memory is not directly mapped into the data memory but is indirectly mapped. That is, an indirect address pointer specifies the address of the data EEPROM memory to read/write. The PIC16F818 device’s 128 bytes of data EEPROM memory have the address range of 00h-7Fh and the PIC16F819 device’s 256 bytes of data EEPROM memory have the address range of 00h-FFh. More details on the EEPROM memory can be found in Section 3.0 “Data EEPROM and Flash Program Memory”. Additional information on device memory may be found in the “PICmicro® Mid-Range Reference Manual” (DS33023). FIGURE 2-1: PROGRAM MEMORY MAP AND STACK FOR PIC16F818 2.1 Program Memory Organization The PIC16F818/819 devices have a 13-bit program counter capable of addressing an 8K x 14 program memory space. For the PIC16F818, the first 1K x 14 (0000h-03FFh) is physically implemented (see Figure 2-1). For the PIC16F819, the first 2K x 14 is located at 0000h-07FFh (see Figure 2-2). Accessing a location above the physically implemented address will cause a wraparound. For example, the same instruc- tion will be accessed at locations 020h, 420h, 820h, C20h, 1020h, 1420h, 1820h and 1C20h. The Reset vector is at 0000h and the interrupt vector is at 0004h. FIGURE 2-2: PROGRAM MEMORY MAP AND STACK FOR PIC16F819 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 03FFh 0400h Wraps to 0000h-03FFh 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 Wraps to 0000h-07FFh |
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