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DSPIC33FJ256MC706IPT Datasheet(PDF) 11 Page - Microchip Technology |
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DSPIC33FJ256MC706IPT Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 90 page  © 2005 Microchip Technology Inc. Preliminary DS70155C-page 9 dsPIC33F 3.2 Programmer’s Model The programmer’s model, shown in Figure 3-2, consists of 16 x 16-bit working registers (W0 through W15), 2 x 40-bit accumulators (ACCA and ACCB), Status Register (SR), Data Table Page register (TBLPAG), Program Space Visibility Page register (PSVPAG), DO and REPEAT registers (DOSTART, DOEND, DCOUNT and RCOUNT) and Program Counter (PC). The working registers can act as data, address or offset registers. All registers are memory mapped. W0 is the W register for all instructions that perform file register addressing. Some of these registers have a shadow register associated with them (see the legend in Figure 3-2). The shadow register is used as a temporary holding register and can transfer its contents to or from its host register upon some event occurring in a single cycle. None of the shadow registers are accessible directly. When a byte operation is performed on a working register, only the Least Significant Byte of the target register is affected. However, a benefit of memory mapped working registers is that both the Least and Most Significant Bytes can be manipulated through byte-wide data memory space accesses. W15 is the dedicated software Stack Pointer (SP). It is automatically modified by exception processing and subroutine calls and returns. However, W15 can be referenced by any instruction in the same manner as all other W registers. This simplifies the reading, writing and manipulation of the Stack Pointer (e.g., creating stack frames). W14 has been dedicated as a Stack Frame Pointer, as defined by the LNK and ULNK instructions. However, W14 can be referenced by any instruction in the same manner as all other W registers. The Stack Pointer always points to the first available free word and grows from lower addresses towards higher addresses. It pre-decrements for stack pops (reads) and post-increments for stack pushes (writes). |
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