Specifications

RX62N Group, RX621 Group RIIC Multi-Master Communication
R01AN0630EJ0100 Rev.1.00 Page 16 of 23
Sep 27, 2011
3.7.10 TDRE Interrupt Handling
Figure 11 shows the flowchart for TDRE interrupt handling.
TDRE Interrupt Handler
return
Data remaining = 0?
(Transmission
complete?)
No
Yes
Disable TXI interrupt
Enable TEI interrupt
First byte of
transmit data?
Disable TXI interrupt
Enable TEI interrupt
Yes
No
Transmit first byte
(address transmission)
Transmit data
Increment master mode
transmit data counter
TDRE = 1?
Data remaining = 0?
Master mode
communication in
progress?
Yes
No
Transmit data
Yes
No
No
Yes
Increment slave mode transmit
data counter
Transmit 0xFF
Set communication
in progress flag
Set communication
in progress flag
Figure 11 TDRE Interrupt Handling