r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 1197

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

23.4.3
The following diagrams explain the timing relationship of all shift and sample processes in the
HSPI. Figure 23.3 shows the conditions when FBS = 0, figure 23.4 shows the conditions when
FBS = 0 (continuous transfer), figure 23.5 shows the conditions when FBS = 1, and figure 23.6
shows the conditions when FBS = 1 (continuous transfer). It can be seen that if CLKP in SPCR is
0, transmit data is shifted at the falling edge of HSPI_CLK and receive data is sampled at the
rising edge of HSPI_CLK. The opposite is true when CLKP = 1.
HSPI_CLK (CLKP = 0)
HSPI_CLK (CLKP = 1)
Data transfer cycle
Timing Diagrams
HSPI_RX
HSPI_CS
HSPI_TX
Figure 23.4 Timing Conditions when FBS = 0 (Continuous Transfer)
HSPI_CLK (CLKP = 0)
HSPI_CLK (CLKP = 1)
Data transfer cycle
HSPI_RX
HSPI_CS
HSPI_TX
Figure 23.3 Timing Conditions when FBS = 0
MSB
MSB
1
2
6
6
MSB
..
MSB
1
LSB
LSB
8
2
6
6
*
3
5
5
4
4
4
5
3
3
Rev.1.00 Jan. 10, 2008 Page 1167 of 1658
6
2
23. Serial Peripheral Interface (HSPI)
2
MSB
MSB
7
9
1
1
LSB
LSB
10
8
6
6
..
*
REJ09B0261-0100
LSB
LSB
16
*