Figure 14.7 Example Of Reception Operation (Ssu Mode) - Renesas H8SX/1520 Series Hardware Manual

(1) When 8-bit data length is selected (SSRDR0 is valid) with CPOS = 0 and CPHS = 0
SCS
SSCK
SSI
RDRF
LSI operation
User operation
(2) When 16-bit data length is selected (SSRDR0 and SSRDR1 are valid) with CPOS = 0 and CPHS = 0
SCS
SSCK
SSI
(LSB first)
SSI
(MSB first)
RDRF
LSI operation
User operation
(3) When 32-bit data length is selected (SSRDR0 to SSRDR3 are valid) with CPOS = 0 and CPHS = 0
SCS
SSCK
SSI
(LSB first)
SSI
(MSB first)
RDRF
LSI operation
User operation
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1 frame
Bit Bit Bit Bit
0 1 2 3
SSTDR0 (LSB first transmission)
Dummy-read SSRDR0
Bit Bit Bit Bit
0 1 2 3
SSRDR1
Bit Bit Bit Bit
7 6 5 4
SSRDR0
Dummy-readSSRDR0
Bit Bit Bit
to
0 7 0
SSRDR3 SSRDR2
Bit Bit Bit
to
7 0 7
SSRDR0 SSRDR1
Dummy-readSSRDR0

Figure 14.7 Example of Reception Operation (SSU Mode)

Section 14 Synchronous Serial Communication Unit (SSU)
Bit Bit Bit Bit Bit
4 5 6 7 7
RXI interrupt
generated
Read SSRDR0
1 frame
Bit Bit Bit Bit Bit Bit Bit
4 5 6 7 0 1 2
Bit Bit Bit Bit Bit Bit Bit
3 2 1 0 7 6 5
Bit Bit Bit Bit
to to to
7 0 7 0
SSRDR1 SSRDR0
Bit Bit Bit Bit
to to to
0 7 0 7
SSRDR2 SSRDR3
RXI interrupt generated
Rev. 3.00 Mar. 14, 2006 Page 535 of 804
1 frame
Bit Bit Bit Bit Bit Bit Bit
6 5 4 3 2 1 0
SSTDR0 (MSB first transmission)
RXI interrupt
generated
Bit Bit Bit Bit Bit
3 4 5 6 7
SSRDR0
Bit Bit Bit Bit Bit
4 3 2 1 0
SSRDR1
RXI interrupt generated
Bit
7
Bit
0
REJ09B0104-0300