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P87LPC764FN 数据表(PDF) 14 Page - NXP Semiconductors |
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P87LPC764FN 数据表(HTML) 14 Page - NXP Semiconductors |
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14 / 60 page  Philips Semiconductors Product data P87LPC764 Low power, low price, low pin count (20 pin) microcontroller with 4 kbyte OTP 2003 Sep 03 13 BIT SYMBOL FUNCTION I2CON.7 RDAT Read: the most recently received data bit. “ CXA Write: clears the transmit active flag. I2CON.6 ATN Read: ATN = 1 if any of the flags DRDY, ARL, STR, or STP = 1. “ IDLE Write: in the I2C slave mode, writing a 1 to this bit causes the I2C hardware to ignore the bus until it is needed again. I2CON.5 DRDY Read: Data Ready flag, set when there is a rising edge on SCL. “ CDR Write: writing a 1 to this bit clears the DRDY flag. I2CON.4 ARL Read: Arbitration Loss flag, set when arbitration is lost while in the transmit mode. “ CARL Write: writing a 1 to this bit clears the CARL flag. I2CON.3 STR Read: Start flag, set when a start condition is detected at a master or non-idle slave. “ CSTR Write: writing a 1 to this bit clears the STR flag. I2CON.2 STP Read: Stop flag, set when a stop condition is detected at a master or non-idle slave. “ CSTP Write: writing a 1 to this bit clears the STP flag. I2CON.1 MASTER Read: indicates whether this device is currently as bus master. “ XSTR Write: writing a 1 to this bit causes a repeated start condition to be generated. I2CON.0 — Read: undefined. “ XSTP Write: writing a 1 to this bit causes a stop condition to be generated. — SU01155 MASTER STP STR ARL DRDY ATN RDAT 0 1 2 3 4 5 6 7 I2CON Reset Value: 81h Bit Addressable1 Address: D8h XSTP XSTR CSTP CSTR CARL CDR IDLE CXA READ WRITE Figure 6. I2C Control Register (I2CON) BIT SYMBOL FUNCTION I2DAT.7 RDAT Read: the most recently received data bit, captured from SDA at every rising edge of SCL. Reading I2DAT also clears DRDY and the Transmit Active state. “ XDAT Write: sets the data for the next transmitted bit. Writing I2DAT also clears DRDY and sets the Transmit Active state. I2DAT.6–0 – Unused. — SU01156 — — — — — — RDAT 0 1 2 3 4 5 6 7 I2DAT Reset Value: xxh Not Bit Addressable Address: D9h — — — — — — — XDAT READ WRITE Figure 7. I2C Data Register (I2DAT) Checking ATN and DRDY When a program detects ATN = 1, it should next check DRDY. If DRDY = 1, then if it receives the last bit, it should capture the data from RDAT (in I2DAT or I2CON). Next, if the next bit is to be sent, it should be written to I2DAT. One way or another, it should clear DRDY and then return to monitoring ATN. Note that if any of ARL, STR, or STP is set, clearing DRDY will not release SCL to high, so that the I2C will not go on to the next bit. If a program detects ATN = 1, and DRDY = 0, it should go on to examine ARL, STR, and STP. |
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