R8C/20 Group, R8C/21 Group 16. Clock Synchronous Serial Interface
Rev.2.00 Aug 27, 2008 Page 343 of 458
REJ09B0250-0200
Figure 16.49 Example of Register Setting in Slave Receive Mode (I
2
C Bus Interface Mode)
End
RDRF = 1 ?
Slave receive mode
No
Yes
(1) Set the AAS bit to 0
(1)
(2) Set the ACKBT bit to the transmit device
(3) Dummy-read to the ICDRR register
(4) Wait 1 byte is received
(5) Judge (last receive - 1)
(6) Read the receive data
(7) Set the ACKBT bit of the last byte
(1)
(8) Read the receive data of (last byte - 1)
(9) Wait the last byte is received
(10) Read the receive data of the last byte
Dummy-read in ICDRR register
Read RDRF bit in ICSR register
Last receive
- 1 ?
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(10)
(9)
ICIER register ACKBT bit ← 0
No
Yes
Read ICDRR register
ICIER register ACKBT bit ← 1
Read ICDRR register
Read RDRF bit in ICSR register
RDRF = 1 ?
Read ICDRR register
No
Yes
NOTE:
1. When receiving 1 byte, skip steps (2) to (6) after (1) and jump to process of step (7).
Process of step (8) is dummy-read in the ICDRR register.
ICSR register AAS bit ← 0
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