SH7205 Datasheet, PDF (858/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

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
SSRXI interrupt
generated
Read SSRDR0
SSRXI 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-read SSRDR0
SSRXI 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-read SSRDR0
SSRXI interrupt generated
Figure 17.7 Example of Reception Operation (SSU Mode)
Rev. 1.00 Mar. 25, 2008 Page 826 of 1868
REJ09B0372-0100