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P12C508 Arkusz danych(PDF) 12 Page - Microchip Technology |
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P12C508 Arkusz danych(HTML) 12 Page - Microchip Technology |
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12 / 84 page  PIC12C5XX DS40139A-page 12 Advance Information © 1996 Microchip Technology Inc. 4.2 Data Memory Organization Data memory is composed of registers, or bytes of RAM. Therefore, data memory for a device is specified by its register file. The register file is divided into two functional groups: special function registers and general purpose registers. The special function registers include the TMR0 register, the Program Counter (PC), the Status Register, the I/O registers (ports), and the File Select Register (FSR). In addition, special purpose registers are used to control the I/O port configuration and prescaler options. The general purpose registers are used for data and control information under command of the instructions. For the PIC12C508, the register file is composed of 7 special function registers and 25 general purpose registers (Figure 4-2). For the PIC12C509, the register file is composed of 7 special function registers, 25 general purpose registers, and 16 general purpose registers that may be addressed using a banking scheme (Figure 4-3). 4.2.1 GENERAL PURPOSE REGISTER FILE The general purpose register file is accessed either directly or indirectly through the file select register FSR (Section 4.7). FIGURE 4-2: PIC12C508 REGISTER FILE MAP File Address 00h 01h 02h 03h 04h 05h 06h 07h 1Fh INDF(1) TMR0 PCL STATUS FSR OSCCAL GPIO General Purpose Registers Note 1: Not a physical register. See Section 4.7 FIGURE 4-3: PIC12C509 REGISTER FILE MAP File Address 00h 01h 02h 03h 04h 05h 06h 07h 1Fh INDF(1) TMR0 PCL STATUS FSR OSCCAL GPIO 0Fh 10h Bank 0 Bank 1 3Fh 30h 20h 2Fh General Purpose Registers General Purpose Registers General Purpose Registers Addresses map back to addresses in Bank 0. Note 1: Not a physical register. See Section 4.7 FSR<6:5> 00 01 |
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