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PCA88021 Datasheet(PDF) 11 Page - NXP Semiconductors |
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PCA88021 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 34 page  PCA8802_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 19 February 2009 11 of 34 NXP Semiconductors PCA8802 Smartcard RTC 9.5.6 Acknowledge The number of data bytes transferred between the START and STOP conditions from transmitter to receiver is unlimited, but the duration of the access must not exceed 32 seconds. Each byte of eight bits is followed by an acknowledge bit. The acknowledge bit is a HIGH level signal put on the bus by the transmitter during which time the master generates an extra acknowledge related clock pulse. A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master receiver must generate an acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges must pull-down the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse (set-up and hold times must be taken into consideration). A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. In this event the transmitter must leave the data line HIGH to enable the master to generate a STOP condition. Acknowledgement is shown in Figure 16. 9.5.7 Data transfer Fig 16. Acknowledgement on the I2C-bus mbc602 S START condition 9 8 2 1 clock pulse for acknowledgement not acknowledge acknowledge data output by transmitter data output by receiver SCL from master Fig 17. A complete data transfer 001aaj201 1 to 7 8 9 ADDRESS ACK DATA DATA S START condition SCL SDA 1 to 7 8 9 1 to 7 8 9 P STOP condition ACK ACK |
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