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ACE8001MT8X Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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ACE8001MT8X Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 31 page 11 www.fairchildsemi.com ACE8001 Product Family Rev. B.2 4.0 Arithmetic Controller Core The ACEx microcontroller core is specifically designed for low cost applications involving bit manipulation, shifting and arith- metic operations. It is based on a modified Harvard architecture meaning peripheral, I/O, and RAM locations are addressed sep- arately from instruction data. The core differs from the traditional Harvard architecture by aligning the data and instruction memory sequentially. This allows the X-pointer (11-bits) to point to any memory location in either segment of the memory map. This modification improves the overall code efficiency of the core and takes advantage of the flexibility found on Von Neumann style machines. 4.1 CPU Registers The ACEx microcontroller has five general-purpose registers. These registers are the Accumulator (A), X-Pointer (X), Pro- gram Counter (PC), Stack Pointer (SP), and Status Register (SR). The X, SP, and SR registers are all memory-mapped. Figure 11: Programming Model 8-bit accumulator register 11-bit X pointer register 10-bit program counter 4-bit stack pointer 8-bit status register NEGATIVE flag HALF CARRY flag (from bit 3) CARRY flag (from MSB) ZERO flag GLOBAL Interrupt Mask READY flag (from EEPROM) A X PC SP SR 0 0 0 0 N H C Z G 0 0 R 7 10 9 3 |
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