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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 560
Jul 04, 2013
(2) Processing flow
Figure 12-111. Timing Chart of Data Reception
(a) When starting data reception
D7 D6 D5 D4 D3 D2 D1 D0
SSmn
SEmn
SOEmn
SDRmn
SCLr output
SDAr output
SDAr input
Shift
register mn
INTIICr
TSFmn
ACK
STmn
TXEmn = 0 / RXEmn = 1
TXEmn,
RXEmn
TXEmn = 1 / RXEmn = 0
Shift operation
“H”
Dummy data (FFH)
Receive data
(b) When receiving last data
D7 D6 D5 D4 D3 D2 D1 D0D2 D1 D0
STmn
SEmn
SOEmn
SDRmn
SCLr output
SDAr output
SDAr input
Shift
register mn
INTIICr
TSFmn
Receive data
Receive data
Output is enabled by serial
communication operation
Output is stopped by serial communication operation
NACKACK
TXEmn = 0 / RXEmn = 1
TXEmn,
RXEmn
Step condition
Reception of last byte
IIC operation stop
SOmn bit
manipulation
CKOmn bit
manipulation
SOmn bit
manipulation
Shift operation
Dummy data (FFH)
Shift operation
Dummy data (FFH)
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), r: IIC number (r = 00, 01, 10, 11, 20, 21),
mn = 00 to 03, 10, 11