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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF8545ATT/A датащи(PDF) 36 Page - NXP Semiconductors |
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PCF8545ATT/A датащи(HTML) 36 Page - NXP Semiconductors |
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36 / 72 page  PCF8545 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 1 — 13 November 2013 36 of 72 NXP Semiconductors PCF8545 Universal LCD driver for multiplex rates up to 1:8 9. Bus interfaces 9.1 Control byte and register selection After initiating the communication over the bus and sending the slave address (I2C-bus, see Section 9.2) or subaddress (SPI-bus, see Section 9.3), a control byte follows. The purpose of this byte is to indicate both, the content for the following data bytes (RAM, or command) and to indicate that more control bytes will follow. Typical sequences could be: • Slave address/subaddress - control byte - command byte - command byte - command byte - end • Slave address/subaddress - control byte - RAM byte - RAM byte - RAM byte - end • Slave address/subaddress - control byte - command byte - control byte - RAM byte - end In this way, it is possible to send a mixture of RAM and command data in one access or alternatively, to send just one type of data in one access. Table 25. Control byte description Bit Symbol Value Description 7CO continue bit 0 last control byte 1 control bytes continue 6 to 5 RS[1:0] register selection 00 command register 01 RAM data 10, 11 unused 4 to 0 - - unused Fig 25. Control byte format |
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