DS83C530-ECL datasheet(7/46 Pages) MAXIM

Part #	DS83C530-ECL

Description	EPROM/ROM Microcontrollers with Real-Time Clock

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Manufacturer	MAXIM [Maxim Integrated Products]

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DS87C530/DS83C530 EPROM/ROM Microcontrollers with Real-Time Clock

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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 use 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 1 shows the register addresses and bit locations.

The High-Speed Microcontroller User’s Guide describes all SFRs.

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