Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 16. Clock Synchronous Serial Interface
Rev.2.00 Aug 27, 2008 Page 342 of 458
REJ09B0250-0200
Figure 16.48 Example of Register Setting in Slave Transmit Mode (I
2
C Bus Interface Mode)
End
Write transmit data to ICDRT register
Slave transmit mode
No
Yes
(1) Set the AAS bit to 0
(2) Set the transmit data (except the last byte)
(3) Wait the ICDRT register is empty
(4) Set the transmit data of the last byte
(5) Wait the last byte is transmitted
(6) Set the TEND bit to 0
(7) Set to slave receive mode
(8) Dummy-read in the ICDRR register to release the
SCL signal
(9) Set the TDRE bit to 0
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 AAS bit ← 0
ICCR1 register TRS bit ← 0
ICSR Register TDRE Bit ← 0
No
Yes
No
Yes
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Dummy-read in ICDRR register

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English