SH7080 Datasheet, PDF (945/1644 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Synchronous Serial Communication Unit (SSU)
(1) When 8-bit data length is selected (SSRDR0 is valid) with CPOS = 0 and CPHS = 0
SCS
1 frame
1 frame
SSCK
SSI
RDRF
Bit Bit Bit Bit Bit Bit Bit Bit
01234567
SSRDR0 (LSB first transmission)
Bit Bit Bit Bit Bit Bit Bit Bit
76543210
SSRDR0 (MSB first transmission)
LSI operation
User operation Dummy-read SSRDR0
RXI interrupt
generated
Read SSRDR0
RXI interrupt
generated
(2) When 16-bit data length is selected (SSRDR0 and SSRDR1 are valid) with CPOS = 0 and CPHS = 0
SCS
1 frame
SSCK
SSI
(LSB first)
SSI
(MSB first)
RDRF
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
01234567 01234567
SSRDR1
SSRDR0
Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit
7654321076543210
SSRDR0
SSRDR1
LSI operation
User operation Dummy-readSSRDR0
RXI interrupt generated
(3) When 32-bit data length is selected (SSRDR0 to SSRDR3 are valid) with CPOS = 0 and CPHS = 0
SCS
1 frame
SSCK
SSI
(LSB first)
SSI
(MSB first)
RDRF
Bit _to Bit Bit _to Bit Bit _to Bit Bit _to Bit
0
70
70
70
7
SSRDR3
SSRDR2
SSRDR1
SSRDR0
Bit _to Bit Bit _to Bit Bit _to Bit Bit _to Bit
7
07
07
07
0
SSRDR0
SSRDR1
SSRDR2
SSRDR3
LSI operation
User operation Dummy-readSSRDR0
RXI interrupt generated
Figure 17.7 Example of Reception Operation (SSU Mode)
Rev. 3.00 May 17, 2007 Page 887 of 1582
REJ09B0181-0300