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DS80C320-MCL Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS80C320-MCL Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 42 page  DS80C320/DS80C323 7 of 42 HIGH-SPEED OPERATION The DS80C320/DS80C323 is built around a high speed 80C32 compatible core. Higher speed comes not just from increasing the clock frequency, but from a newer, more efficient design. In this updated core, dummy memory cycles have been eliminated. In a conventional 80C32, machine cycles are generated by dividing the clock frequency by 12. In the DS80C320/DS80C323, the same machine cycle is performed in 4 clocks. Thus the fastest instruction, one machine cycle, is executed three times faster for the same crystal frequency. Note that these are identical instructions. A comparison of the timing differences is shown in Figure 2. The majority of instructions will see the full 3 to 1 speed improvement. Some instructions will get between 1.5 and 2.4 X improvement. Note that all instructions are faster than the original 80C51. Table 2 below shows a summary of the instruction set including the speed. The numerical average of all opcodes is approximately a 2.5 to 1 speed improvement. Individual programs will be affected differently, depending on the actual instructions used. Speed-sensitive applications would make the most use of instructions that are three times faster. However, the sheer number of 3 to 1 improved opcodes makes dramatic speed improvements likely for any code. The Dual Data Pointer feature also allows the user to eliminate wasted instructions when moving blocks of memory. INSTRUCTION SET SUMMARY All instructions in the DS80C320/DS80C323 perform the same functions as their 80C32 counterparts. Their effect on bits, flags, and other status functions is identical. However, the timing of each instruction is different. This applies both in absolute and relative number of clocks. For absolute timing of real-time events, the timing of software loops will need to be calculated using the table below. However, counter/timers default to run at the older 12 clocks per increment. Therefore, while software runs at higher speed, timer-based events need no modification to operate as before. Timers can be set to run at 4 clocks per increment cycle to take advantage of higher speed operation. The relative time of two instructions might be different in the new architecture than it was previously. For example, in the original architecture, the “MOVX A, @DPTR” instruction and the “MOV direct, direct” instruction used two machine cycles or 24 oscillator cycles. Therefore, they required the same amount of time. In the DS80C320/DS80C323, the MOVX instruction can be done in two machine cycles or eight oscillator cycles but the “MOV direct, direct” uses three machine cycles or 12 oscillator cycles. While both are faster than their original counterparts, they now have different execution times from each other. This is because in most cases, the DS80C320/DS80C323 uses one cycle for each byte. The user concerned with precise program timing should examine the timing of each instruction for familiarity with the changes. Note that a machine cycle now requires just four clocks, and provides one ALE pulse per cycle. Many instructions require only one cycle, but some require five. In the original architecture, all were one or two cycles except for MUL and DIV. |
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