PDF AN560 Data sheet ( Hoja de datos )

Número de pieza	AN560
Descripción	Lowpower 3-wire non-volatile memories
Fabricantes	Microchip Technology
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No Preview Available ! www.DataSheet.co.kr Using the 93LC56 and 93LC66 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 © 1994 Microchip Technology Inc. 8-99 DS00560D-page 1 Datasheet pdf - http://www.DataSheet4U.net/ 1 page www.DataSheet.co.kr Using the 93LC56 and 93LC66 0189 0190 0191 0192 0193 0194 0195 0196 0197 0198 0199 0200 0201 0202 0203 0204 003A 0C08 003B 0033 003C 003D 003E 003F 0040 0041 0042 0043 0044 0045 0046 0901 0C02 0032 0C80 0030 0929 0C08 0032 020C 0030 0929 rbyte 0047 0914 movlw movwf call movlw movwf movlw movwf call movlw movwf movf movwf call call .8 bytcnt BSTART .2 bits b’10000000' txbuf TX .8 bits addr,w txbuf TX RX ; set number of addresses to ; read as 8 ; ; generate the start bit ; set # bits to 2 ; ; get opcode (10b) ; into output buffer ; and transmit it ; ; set number of bits to 8 ; get the address ; into the output buffer ; and transmit it ; read the high byte 16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:10 1994 Page 5 Line PC Opcode 0205 0206 0207 0208 0209 0210 0211 0212 0213 0214 0215 0216 0217 0218 0048 020D 0049 0037 004A 0914 004B 020D 004C 0037 004D 0486 004E 004F 0050 0051 02AC 02F3 0A3C 0A38 0000 END movf datai,w movwf hbyte ; move input data to w ; xfer it to high byte call movf movwf RX datai,w hbyte ; read the low byte ; move input data to w ; xfer it to low byte bcf port_b,chpsel ; clear the chip select line incf decfsz goto goto addr bytcnt rbyte READ ; add 1 to the address ; have all bytes been read? ; no, read another byte ; yes, start over 8 © 1994 Microchip Technology Inc. 8-103 DS00560D-page 5 Datasheet pdf - http://www.DataSheet4U.net/ 5 Page www.DataSheet.co.kr Using the 93LC56 and 93LC66 16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:00 1994 Page 1 Line PC Opcode 0001 0002 0003 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015 0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029 0030 0031 0032 0033 0034 0035 0036 0037 0038 0039 0040 0041 0042 0043 0044 0045 0046 0047 0048 0049 0050 0051 LIST P=16C54,c=132 ;************************************************************** ; 3-Wire Byte Write with Data Poll Program (107 bytes) ; ; This program demonstrates how to interface a ; Microchip PIC16C54 to a 93LC56 or 93LC66 Serial EE ; device. This program will execute the erase/write enable ; command, write to 8 consecutive addresses, and then ; use the ‘data polling’ method to determine when the ; write cycle is complete. The program then executes ; the erase/write disable command. This sequence will ; repeat forever. ; ; When writing to a 3-wire serial EE device, the ; internally timed write cycle will begin after ; the opcode, address and data are sent to the ; device. There are two ways to make sure that the ; cycle is complete before you send it another command. ; The simplest method is to simply wait for the maximum ; write cycle time, which can be obtained from the data book. ; A more efficient method is “Data polling.” This is ; done by toggling the chip select line low and then ; back high after the opcode, address and data are sent. ; The chip select line must be low for at least 250ns ; before bringing it high again. The device will pull ; the data out line low at that point, and set it high ; when the write cycle is complete. The user can then check ; or “poll” the dataout line until it goes high before ; sending the next command. ; ; As an option, the user can connect a LED to pin 18 ; on the PIC16C54 (use about a 1K resistor in series) as a ; timeout indicator. This LED will come on if the ; data polling is unsuccessful and the device being ; programmed does not respond. This can be tested by ; simply running the program with no part in the socket. ; ; This program communicates to the serial EE in the ; x16 mode, and ASSUMES THE USER HAS SET THE ORG PIN ; ON THE DEVICE TO Vcc. ; ; Timing is based on using the PIC16C54 in ‘XT’ mode ; using a 4Mhz crystal. Clock speeds to the serial EE ; will be approximately 50 kHz for this setup. ; ; PIC16C54 to Serial EE Connections: ; ; PIC16C54 Serial EE ; —————— —————— ; Pin 10 (RB4) —> Chip Select ; Pin 11 (RB5) —> Clock 16c5x/7x Cross-Assembler V4.12 Released Mon Jun 06 10:49:00 1994 Page 2 Line PC Opcode 0052 0053 0054 0055 0056 0057 0058 0059 0060 0005 0006 ; Pin 12 (RB6) —> Data In ; Pin 13 (RB7) —> Data Out ; ORG=Vcc ; ;******************************************************** ; Register Assignments ;********************************************************** port_a equ 5h ; port 5 (port_a) port_b equ 6h ; port 6 (port b) used comm lines to serial EE 8 © 1994 Microchip Technology Inc. 8-109 DS00560D-page 11 Datasheet pdf - http://www.DataSheet4U.net/ 11 Page

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