Datasheet

Section 20 Synchronous Serial Communication Unit (SSU)
R01UH0309EJ0500 Rev. 5.00 Page 1131 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
(4) Data Transmission/Reception
Figure 20.9 shows a flowchart example of simultaneous transmission/reception. The data
transmission/reception is performed combining the data transmission and data reception as
mentioned above. The data transmission/reception is started by writing transmit data to SSTDR
with TE = RE = 1.
Before switching transmission mode (TE = 1) or reception mode (RE = 1) to
transmission/reception mode (TE = RE = 1), clear the TE and RE bits to 0. When starting the
transfer, confirm that the TEND, RDRF, and ORER bits are cleared to 0 before setting the TE or
RE bit to 1.