HD6433682 ETC, HD6433682 Datasheet - Page 330
HD6433682
Manufacturer Part Number
HD6433682
Description
Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
Manufacturer
ETC
Datasheet
1.HD6433682.pdf
(504 pages)
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17.4.2
In master transmit mode, the master device outputs the transmit clock and transmit data, and the
slave device returns an acknowledge signal. For master transmit mode operation timing, refer to
figures 17.5 and 17.6. The transmission procedure and operations in master transmit mode are
described below.
1. Set the ICE bit in ICCR1 to 1. Set the MLS and WAIT bits in ICMR and the CKS3 to CKS0
2. Read the BBSY flag in ICCR2 to confirm that the bus is free. Set the MST and TRS bits in
3. After confirming that TDRE in ICSR has been set, write the transmit data (the first byte data
4. When transmission of one byte data is completed while TDRE is 1, TEND in ICSR is set to 1
5. The transmit data after the second byte is written to ICDRT every time TDRE is set.
6. Write the number of bytes to be transmitted to ICDRT. Wait until TEND is set (the end of last
7. When the STOP bit in ICSR is set to 1, the operation returns to the slave receive mode.
Rev. 3.00, 05/03, page 300 of 472
bits in ICCR1 to 1. (Initial setting)
ICCR1 to select master transmit mode. Then, write 1 to BBSY and 0 to SCP using MOV
instruction. (Start condition issued) This generates the start condition.
show the slave address and R/W) to ICDRT. At this time, TDRE is automatically cleared to 0,
and data is transferred from ICDRT to ICDRS. TDRE is set again.
at the rise of the 9th transmit clock pulse. Read the ACKBR bit in ICIER, and confirm that the
slave device has been selected. Then, write second byte data to ICDRT. When ACKBR is 1,
the slave device has not been acknowledged, so issue the stop condition. To issue the stop
condition, write 0 to BBSY and SCP using MOV instruction. SCL is fixed low until the
transmit data is prepared or the stop condition is issued.
byte data transmission) while TDRE is 1, or wait for NACK (NACKF in ICSR = 1) from the
receive device while ACKE in ICIER is 1. Then, issue the stop condition to clear TEND or
NACKF.
Stop condition. The master device drives SDA from low to high while SCL is high.
Master Transmit Operation
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