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R8C/20 Datasheet(PDF) 356 Page - Renesas Technology Corp |
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R8C/20 Datasheet(HTML) 356 Page - Renesas Technology Corp |
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356 / 501 page  R8C/20 Group, R8C/21 Group 16. Clock Synchronous Serial Interface Rev.2.00 Aug 27, 2008 Page 340 of 458 REJ09B0250-0200 16.3.7 Examples of Register Setting Figure 16.46 to Figure 16.49 show the Examples of Register Setting When Using I2C Bus Interface. Figure 16.46 Example of Register Setting in Master Transmit Mode (I2C Bus Interface Mode) Start Initial setting Read BBSY bit in ICCR2 register End BBSY = 0 ? Write transmit data to ICDRT register Transmit mode ? Master receive mode TEND = 1 ? No Yes Yes No (1) Judge the state of the SCL and SDA lines (2) Set to master transmit mode (3) Generate the start condition (4) Set the transmit data of the 1st byte (slave address + R/W) (5) Wait for 1 byte to be transmitted (6) Judge the ACKBR bit from the specified slave device (7) Set the transmit data after 2nd byte (except the last byte) (8) Wait the ICDRT register is empty (9) Set the transmit data of the last byte (10) Wait for the transmit end of the last byte (11) Set the TEND bit to 0 (12) Set the STOP bit to 0 (13) Generate the stop condition (14) Wait the stop condition is generated (15) Set to slave receive mode Set the TDRE bit to 0 ICCR1 register TRS bit ← 1 MST bit ← 1 ICCR2 register SCP bit ← 0 BBSY bit ← 1 Read TEND bit in ICSR register No Read ACKBR bit in ICIER register Yes ACKBR = 0 ? Write transmit data to ICDRT register TDRE = 1 ? Read TDRE bit in ICSR register Last byte ? Write transmit data to ICDRT register TEND = 1 ? Read TEND bit in ICSR register ICSR register TEND bit ← 0 ICSR register STOP bit ← 0 ICCR2 register SCP bit ← 0 BBSY bit ← 0 Read STOP bit in ICSR register STOP = 1 ? ICCR1 register TRS bit ← 0 MST bit ← 0 ICSR register TDRE bit ← 0 No Yes No Yes No Yes No Yes No Yes (1) (2) (3) (4) (5) (6) (7) (8) (12) (10) (13) (14) (11) (9) (15) - Set the STOP bit in the ICSR register to 0. - Set the IICSEL bit in the PMR register to 1. |
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