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PIC16F5X Folha de dados(PDF) 16 Page - Microchip Technology |
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PIC16F5X Folha de dados(HTML) 16 Page - Microchip Technology |
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16 / 88 page  PIC16F5X DS41213D-page 14 © 2007 Microchip Technology Inc. 3.2 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 (SFR) and General Purpose Registers (GPR). The Special Function Registers include the TMR0 register, the Program Counter (PC), the STATUS regis- ter, 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 PIC16F54, the register file is composed of 7 Special Function Registers and 25 General Purpose Registers (Figure 3-3). For the PIC16F57, the register file is composed of 8 Special Function Registers, 8 General Purpose Registers and 64 additional General Purpose Registers that may be addressed using a banking scheme (Figure 3-4). For the PIC16F59, the register file is composed of 10 Special Function Registers, 6 General Purpose Registers and 128 additional General Purpose Registers that may be addressed using a banking scheme (Figure 3-5). 3.2.1 GENERAL PURPOSE REGISTER FILE The register file is accessed either directly or indirectly through the File Select Register (FSR). The FSR register is described in Section 3.7 “Indirect Data Addressing; INDF and FSR Registers”. FIGURE 3-3: PIC16F54 REGISTER FILE MAP FIGURE 3-4: PIC16F57 REGISTER FILE MAP File Address 00h 01h 02h 03h 04h 05h 06h 1Fh INDF(1) TMR0 PCL STATUS FSR PORTA PORTB General Purpose Registers Note 1: Not a physical register. See Section 3.7 “Indirect Data Addressing; INDF and FSR Registers” . 07h File Address 00h 01h 02h 03h 04h 05h 06h 07h 1Fh INDF(1) TMR0 PCL STATUS FSR PORTA PORTB 0Fh 10h Bank 0 Bank 1 Bank 2 Bank 3 3Fh 30h 20h 2Fh 5Fh 50h 40h 4Fh 7Fh 70h 60h 6Fh General Purpose Registers General Purpose Registers General Purpose Registers General Purpose Registers General Purpose Registers PORTC 08h Addresses map back to addresses in Bank 0. Note 1: Not a physical register. See Section 3.7 “Indirect Data Addressing; INDF and FSR Registers”. FSR<6:5> 00 01 10 11 |
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