Datasheet

Section 20 Serial Communication Interface 3 (SCI3, IrDA)
Page 714 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Transmitting
station
Receiving
station A
Receiving
station B
Receiving
station C
Receiving
station D
(ID = 01) (ID = 02) (ID = 03) (ID = 04)
Serial transmission line
Serial
data
ID transmission cycle =
Receiving station
specification
Data transmission cycle =
Data transmission to
receiving station specified by ID
(MPB = 1) (MPB = 0)
H'01 H'AA
Legend
MPB: Multiprocessor bit
Figure 20.15 Example of Inter-Processor Communication Using Multiprocessor Format
(Transmission of Data H'AA to Receiving Station A)
20.5.1 Multiprocessor Data Transmission
Figure 20.16 shows a sample flowchart for multiprocessor data transmission. For an ID
transmission cycle, set the MPBT bit in SSR to 1 before transmission. For a data transmission
cycle, clear the MPBT bit in SSR to 0 before transmission. All other SCI3 operations are the same
as those in asynchronous mode.