TPS-1 User’s Manual: Hardware
3. Host Interface
R19UH0081ED0107 Rev. 1.07
page 33 of 86
Jul 30, 2018
3.3.3. SPI Slave Interface Reset Timing
Figure 3-14 describes the behavior when a reset for the SPI Slave interface occurs. The communication process is interrupted and after a wait time of 4
system clocks (40 ns for the TPS-1), the next transfer can start.
Motorola SPI
format:
SPO = 0
SPH = 0
B5
B4
B3
B1
B2
B0
HOST_SCLK_IN
SPI-Header
MSBit
LSBit
MSBit
HOST_SFRN_IN
HOST_SRXD_IN
HOST_STXD_IN
HOST_SHDR_OUT
B15 B14 B13 B12
4 x SysCLK
B7
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
B4
B3
B2
B1
B0
HOST_RESET_IN
SPI-Data
MSBit
LSBit
Dummy
Dummy
Dummy
Dummy
Dummy
Dummy
Dummy
Dummy
Dummy
Dummy
Figure 3-16: SPI Slave Reset Timing
The signal HOST_RESET_IN is the only way to set the slave interface to a defined status. The signal is active high. During the normal operation the
signal is set to “low level”.
If you want to ensure that the previous transfer is completed terminated, the following waiting time must be observed:
T
Wait
= ((32 * f
sys
/f
SPI
) - 10) + 4 clock pulse;
This time applies after the rising clock edge of HOST_SCLK_IN. In addition, HOST_RESET_IN may only become active simultaneously with
HOST_SFRN_IN at the earliest.
Содержание TPS-1
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