AN87C54 Intel Corporation, AN87C54 Datasheet
AN87C54
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AN87C54 Summary of contents
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... Intel products except as provided in Intel’s Terms and Conditions of Sale for such products Intel retains the right to make changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata COPYRIGHT INTEL CORPORATION 1995 87C54 87C54-20 Automotive ...
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AUTOMOTIVE 87C54 87C54-20 2 Figure 1 87C54 Block Diagram 270849 – 1 ...
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... ambient With a the extended temperature range option operational Example AN87C54 indicates an automotive temperature range version of the 87C54 in a PLCC package with 16 Kbyte EPROM program memory Temperature Classification Extended Automotive AUTOMOTIVE 87C54 87C54-20 characteristics are guaranteed over the temperature ...
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AUTOMOTIVE 87C54 87C54-20 PACKAGES Part Prefix Package Type 87C54 AP 40-Pin Plastic DIP 87C54 AN 44-Pin PLCC DIP (PDIP) Do not connect reserved pins PAD (PLCC) Figure 3 Pin Connections PIN DESCRIPTIONS V Supply voltage CC V Circuit ground SS ...
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Port 2 emits the high-order address byte during fetches from external Program Memory and during accesses to external Data Memory that use 16-bit addresses (MOVX DPTR) In this application it uses strong internal pullups when emitting 1’s Dur- ing accesses ...
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AUTOMOTIVE 87C54 87C54- for Crystals e g For Ceramic Resonators contact resonator manufacturer Figure 4 Oscillator Connections To drive the device from an external clock source XTAL1 should be driven while XTAL2 floats as ...
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ONCE MODE The ONCE (‘‘On-Circuit Emulation’’) Mode facilitates testing and debugging of systems using the 87C54 without the 87C54 having to be removed from the circuit The ONCE Mode is invoked by 1) Pull ALE low while the device is ...
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AUTOMOTIVE 87C54 87C54-20 ABSOLUTE MAXIMUM RATINGS Ambient Temperature Under Bias Storage Temperature Voltage Pin Voltage on Any Other Pin ...
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NOTES 1 Capacitive loading on Ports 0 and 2 may cause noise pulses to be superimposed on the V 3 The noise is due to external bus capacitance discharging into the Port 0 and Port 2 pins when these pins ...
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AUTOMOTIVE 87C54 87C54-20 EXPLANATION OF THE AC SYMBOLS Each timing symbol has 5 characters The first char- acter is always a ‘T’ (stands for time) The other characters depending on their positions stand for the name of a signal or ...
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EXTERNAL MEMORY CHARACTERISTICS Symbol Parameter T RD Pulse Width RLRH T WR Pulse Width WLWH T RD Low to Valid RLDV Data In T Data Hold After RD RHDX High T Data Float After RD RHDZ High T ALE Low ...
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AUTOMOTIVE 87C54 87C54-20 EXTERNAL PROGRAM MEMORY READ CYCLE EXTERNAL DATA MEMORY READ CYCLE EXTERNAL DATA MEMORY WRITE CYCLE 12 270849 –12 270849 –13 270849 –14 ...
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SERIAL PORT TIMING SHIFT REGISTER MODE Test Conditions Symbol Parameter T Serial Port Clock Cycle Time XLXL T Output Data Setup to Clock QVXH Rising Edge T Output Data Hold after XHQX Clock ...
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AUTOMOTIVE 87C54 87C54-20 AC TESTING INPUT OUTPUT WAVEFORMS AC Inputs during testing are driven for a Logic ‘‘1’’ and 0 45V for a Logic ‘‘0’’ Timing measurements are made at V min for a ...
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Normally held at logic high until just be- PP fore ALE PROG pulsed Then EA V raised to V ALE PROG is pulsed low and then returned to a valid ...
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AUTOMOTIVE 87C54 87C54-20 Figure 13 Verifying the EPROM 16 Figure 12 PROG Waveforms 270849 –22 270849 –23 ...
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PROGRAMMING ALGORITHM Refer to Table 3 and Figures 11 and 14 for address data and control signals set up To program the 87C54 the following sequence must be exercised 1 Input the valid address on the address lines 2 Input ...
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AUTOMOTIVE 87C54 87C54-20 EPROM Program Lock The 87C54 program lock system grammed protect the onboard program against soft- ware piracy The 87C54 has a 3-level program lock system and a 64-byte encryption array Since this is an EPROM device all ...
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EPROM PROGRAMMING AND VERIFICATION CHARACTERISTICS ( 20 ADVANCED INFORMATION CONTACT INTEL FOR DESIGN-IN INFORMATION Symbol Parameter V Programming Supply Voltage PP I Programming Supply Current PP 1 ...
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AUTOMOTIVE 87C54 87C54-20 DATA SHEET REVISION HISTORY The following are key differences between this data sheet and the -003 version of the data sheet 1 The data sheet has been revised to include the 20 MHz 87C54 The title was ...