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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TUSB6250 датащи(PDF) 79 Page - Texas Instruments |
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TUSB6250 датащи(HTML) 79 Page - Texas Instruments |
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79 / 125 page  I2C Interface Controller 10−6 SLLS535E − April 2008 TUSB6250 10.5 Byte-Write Operation The byte-write operation involves three phases: device address + EEPROM [high byte] phase, EEPROM [low byte] phase, and EEPROM [DATA] phase. The following describes the sequence of events to accomplish the byte-write transaction. Device Address + EEPROM [High Byte] • The MCU sets I2CSCR [STOP] = 0. This forces the I2C interface controller not to generate a stop condition after the contents of the I2CDOUT register are transmitted. • The MCU writes the device address (R/W bit = 0) to the I2CADR register (write operation). • The MCU writes the high byte of the I2C EEPROM address into the I2CDOUT register (this starts the transfer on the SDA line). • The TXE bit in the I2CSCR register is cleared (indicates busy). • The contents of the I2CADR register are transmitted to the I2C EEPROM (preceded by a start condition on SDA). • The contents of the I2CDOUT register are transmitted to the I2C EEPROM (EEPROM high address). • The TXE bit in the I2CSCR register is set and interrupts the MCU, indicating that the I2CDOUT register contents have been transmitted. EEPROM [Low Byte] • The MCU writes the low byte of the I2C EEPROM address into the I2CDOUT register. • The TXE bit in the I2CSCR register is cleared (indicating busy). • The contents of the I2CDOUT register are transmitted to the I2C EEPROM (EEPROM low address). • The TXE bit in the I2CSCR register is set and interrupts the MCU, indicating that the I2CDOUT register contents have been transmitted. EEPROM [DATA] • The MCU sets I2CSCR [STOP] = 1. This forces the I2C interface controller to generate a stop condition after the contents of I2CDOUT register are transmitted. • The data to be written to I2C EEPROM is written by the MCU into the I2CDOUT register. • The TXE bit in the I2CSCR register is cleared (indicates busy). • The contents of the I2CDOUT register are transmitted to the I2C EEPROM (EEPROM data). • The TXE bit in the I2CSCR register is set and interrupts the MCU, indicating that the I2CDOUT register contents have been transmitted. • The I2C interface controller generates a stop condition after the contents of the I2CDOUT register are transmitted. • End |
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