R8C32A Datasheet, PDF (405/603 Pages) Renesas Technology Corp – MCU M16C FAMILY / R8C/Tiny SERIES

Under development ^{Preliminary specification}
Specifications in this manual are tentative and subject to change.
R8C/32A Group
24. Synchronous Serial Communication Unit (SSU)
24.5.2 Data Transmission
Figure 24.11 shows an Example of Synchronous Serial Communication Unit Operation during Data
Transmission (4-Wire Bus Communication Mode). During the data transmit operation, synchronous serial
communication unit operates as described below.
When the MCU is set as the master device, it outputs a synchronous clock and data. When the MCU is set as a
slave device, it outputs data in synchronization with the input clock while the SCS pin is “L”.
When the transmit data is written to the SSTDR register after setting the TE bit to 1 (transmit enabled), the
TDRE bit is automatically set to 0 (data has not been transferred from registers SSTDR to SSTRSR) and the
data is transferred from registers SSTDR to SSTRSR. After the TDRE bit is set to 1 (data is transferred from
registers SSTDR to SSTRSR), transmission starts. When the TIE bit in the SSER register is set to 1, a TXI
interrupt request is generated.
After 1 frame of data is transferred while the TDRE bit is set to 0, the data is transferred from registers SSTDR
to SSTRSR and transmission of the next frame is started. If the 8th bit is transmitted while TDRE is set to 1,
TEND in the SSSR register is set to 1 (when the last bit of the transmit data is transmitted, the TDRE bit is set
to 1) and the state is retained. If the TEIE bit in the SSER register is set to 1 (transmit-end interrupt requests
enabled), a TEI interrupt request is generated. The SSCK pin remains “H” after transmit-end and the SCS pin is
held “H”. When transmitting continuously while the SCS pin is held “L”, write the next transmit data to the
SSTDR register before transmitting the 8th bit.
Transmission cannot be performed while the ORER bit in the SSSR register is set to 1 (overrun error). Confirm
that the ORER bit is set to 0 before transmission.
In contrast to the clock synchronous communication mode, the SSO pin is placed in high-impedance state while
the SCS pin is placed in high-impedance state when operating as a master device and the SSI pin is placed in
high-impedance state while the SCS pin is placed in “H” input state when operating as a slave device.
The sample flowchart is the same as that for the clock synchronous communication mode (refer to Figure 24.6
Sample Flowchart of Data Transmission (Clock Synchronous Communication Mode)).
The data transfer length can be set from 8 to 16 bits using the SSBR register.
REJ09B0458-0010 Rev.0.10 Apr 01, 2008
Page 377 of 572