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93LC66 Datasheet(PDF) 1 Page - Microchip Technology |
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93LC66 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 22 page  © 1994 Microchip Technology Inc. DS00560D-page 1 Using the 93LC56 and 93LC66 8 AN560 Using the 93LC56 and 93LC66 INTRODUCTION The Microchip Technology Inc. 93LC56/66 are low- power 3-wire non-volatile memories and are suitable for many embedded system code and data storage applica- tions. These devices are easily interfaced to most micro- controllers in today's market place, but Microchip’s 8-bit RISC series PIC16CXX offers the best code density of any microcontroller on the market today. Using the PIC16C54, the assembly programs contained in this application note have been fully tested and provide the correct timing and 3-wire sequences to fully operate the 93LC56/66 in a PIC16CXX-based embedded applica- tion. The PIC16C54 was clocked at a 10MHz frequency. This application note is intended to provide the engineer with readily available stand-alone code modules to accomplish all of the necessary functions to utilize these devices in a low power application using the efficient PIC16C54 microcontroller. The 93 series of devices have essentially four I/O pins: CS Chip Select CLK Clock DI Data In DO Data Out This series of devices use a series of commands to accomplish the normal memory functions. These are READ, WRITE, EWEN, ERASE, ERAL, WRAL, EWDS. For a more detailed discussion of the function of these devices reference the appropriate data sheet and AN536, also published by Microchip Technology. The following programs are included in this application note and are fully functional stand-alone modules. They are intended for use by those who are not already familiar with interfacing a PIC16CXX microcontroller to a 93 series device. For those with more experience, please refer to application note AN530. 3-Wire Byte Read Program – Start Bit Routine – Receive Data Routine – Bit Out Routine – Transmit Data Routine – Power-up Routine – Read Routine 3-Wire Byte Write Program – Delay Routine – Start Bit Routine – Bit Out Routine – Transmit Data Routine – Power-up Routine – Erase/Write Enable Routine (EWEN) – Byte Write Routine – Erase/Write Disable Routine (EWDS) 3-Wire Byte Write with Data Polling Program – Data Polling Delay Routine – Start Bit Routine – Bit Out Routine – Transmit Data Routine – Power-up Routine – Erase/Write Enable Routine – Write Routine – Erase/Write Disable Routine (EWDS) 3-Wire Sequential Read Program – Delay Routine – Start Bit Routine – Bit In Routine – Receive Data Routine – Bit Out Routine – Transmit Data Routine – Power-up Routine – Read Routine Author: Bruce Negley Memory Products Division 8-99 |
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