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BR93A66RFVJ-WE2 Datasheet(PDF) 11 Page - Rohm |
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BR93A66RFVJ-WE2 Datasheet(HTML) 11 Page - Rohm |
11 / 41 page Technical Note BR93L□□-W Series, 93A□□-WM Series, BR93H□□-WC Series 11/40 www.rohm.com 2011.09 - Rev.G © 2011 ROHM Co., Ltd. All rights reserved. ●Description of operations Communications of the Microwire Bus are carried out by SK (serial clock), DI (serial data input),DO (serial data output) ,and CS (chip select) for device selection. When to connect one EEPROM to a microcontroller, connect it as shown in Fig.59(a) or Fig.59(b). When to use the input and output common I/O port of the microcontroller, connect DI and DO via a resistor as shown in Fig.59(b) (Refer to pages 17/35.), and connection by 3 lines is available. In the case of plural connections, refer to Fig. 59 (c). Communications of the Microwire Bus are started by the first “1” input after the rise of CS. This input is called a start bit. After input of the start bit, input ope code, address and data. Address and data are input all in MSB first manners. “0” input after the rise of CS to the start bit input is all ignored. Therefore, when there is limitation in the bit width of PIO of the microcontroller, input “0” before the start bit input, to control the bit width. ●Command mode Command Start bit Ope code Address Data BR93L46-W BR93A46-WM BR93L56/66-W BR93A56/66-WM BR93L76/86-W BR93A76/86-WM Read (READ) *1 1 10 A5,A4,A3,A2,A1,A0 A7,A6,A5,A4,A3,A2,A1,A0 A9,A8,A7,A6,A5,A4,A3,A2,A1,A0 D15~D0(READ DATA) Write enable (WEN) 1 00 1 1 * * * * 1 1 * * * * * * 1 1 * * * * * * * * Write (WRITE) *2 1 01 A5,A4,A3,A2,A1,A0 A7,A6,A5,A4,A3,A2,A1,A0 A9,A8,A7,A6,A5,A4,A3,A2,A1,A0 D15~D0(WRITE DATA) Write all (WRAL) *2 1 00 0 1 * * * * 0 1 * * * * * * 0 1 * * * * * * * * D15~D0(WRITE DATA) Write disable (WDS) 1 00 0 0 * * * * 0 0 * * * * * * 0 0 * * * * * * * * Erase (ERASE) 1 11 A5,A4,A3,A2,A1,A0 A7,A6,A5,A4,A3,A2,A1,A0 A9,A8,A7,A6,A5,A4,A3,A2,A1,A0 Chip erase (ERAL) 1 00 1 0 * * * * 1 0 * * * * * * 1 0 * * * * * * * * ・ Input the address and the data in MSB first manners. ・ As for *, input either VIH or VIL. *Start bit Acceptance of all the commands of this IC starts at recognition of the start bit. The start bit means the first “1” input after the rise of CS. *1 As for read, by continuous SK clock input after setting the read command, data output of the set address starts, and address data in significant order are sequentially output continuously. (Auto increment function) *2 When the read and the write all commands are executed, data written in the selected memory cell is automatically deleted, and input data is written. Fig.59-(a) Connection by 4 lines CS SK DO DI CS SK DO CS SK DI DO Fig.59-(b) Connection by 3 lines CS SK DI DO CS3 CS1 CS0 SK DO DI Device 1 Device 2 Device 3 Fig.59-(c) Connection example of plural devices Fig.59 Connection method with microcontroller Micro- controller BR93LXX /AXX Micro- controller Micro- controller A7 of BR93L56-W/A56-WM becomes Don't Care. A9 of BR93L76-W/A76-WM becomes Don't Care. BR93LXX /AXX |
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