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DS83C530-ECL Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS83C530-ECL Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 44 page  DS87C530/DS83C530 7 of 44 INSTRUCTION SET SUMMARY All instructions perform the same functions as their 8051 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 can be calculated using a table in the High-Speed Microcontroller User’s Guide. However, counter/timers default to run at the older 12 clocks per increment. In this way, timer-based events occur at the standard intervals with software executing at higher speed. Timers optionally can run at 4 clocks per increment to take advantage of faster processor 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 DS87C530/DS83C530, the MOVX instruction takes as little as 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. This is because the DS87C530/DS83C530 usually uses one instruction cycle for each instruction 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 4 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. Refer to the High-Speed Microcontroller User’s Guide for details and individual instruction timing. SPECIAL FUNCTION REGISTERS Special Function Registers (SFRs) control most special features of the DS87C530/DS83C530. This allows the device to incorporate new features but remain instruction set compatible with the 8051. EQUATE statements can be used to define the new SFR to an assembler or compiler. All SFRs contained in the standard 80C52 are duplicated in this device. Table 2 shows the register addresses and bit locations. The High-Speed microcontroller User’s Guide describes all SFRs. |
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Similar Description - DS83C530-ECL |
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