r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 581

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
26.4.4
In slave transmit mode, the slave device outputs the transmit data while the master device outputs the receive
clock and returns an acknowledge signal.
Figures 26.9 and 26.10 show the Operating Timing in Slave Transmit Mode (I
The transmit procedure and operation in slave transmit mode are as follows.
(1) Set the ICE bit in the ICCR1 register to 1 (transfer operation enabled), and set bits WAIT and MLS in the
(2) When the slave address matches at the first frame after detecting the start condition, the slave device
(3) When the TDRE bit in the ICDRT register is set to 1 after the last transmit data is written to the ICDRT
(4) Set the TRS bit to 0 and dummy read the ICDRR register to end the process. This will release the SCL
(5) Set the TDRE bit to 0.
ICMR register and bits CKS0 to CKS3 in the ICCR1 register (initial setting). Then, set bits TRS and MST
in the ICCR1 register to 0 and wait until the slave address matches in slave receive mode.
outputs the level set by the ACKBT bit in the ICIER register to the SDA pin at the rising edge of the 9th
clock cycle. At this time, if the 8th bit of data (R/W) is 1, bits TRS and TDRE in the ICSR register are set to
1, and the mode is switched to slave transmit mode automatically. Continuous transmission is enabled by
writing transmit data to the ICDRT register every time the TDRE bit is set to 1.
register, wait until the TEND bit in the ICSR register is set to 1 while the TDRE bit is set to 1. When the
TEND bit is set to 1, set the TEND bit to 0.
signal.
Slave Transmit Operation
2
C bus Interface Mode).
26. I
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2
C bus Interface