Hardware Development Guide of Module Product
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Waiting mode: The waiting mode of SPI is a configurable low-power mode, enabled
by the byte of the control registered. In the waiting mode, if the waiting byte is
cleared, SPI works under the similar running mode. However, if SPI waits for the
position byte, SPI clock stops and enters the low-power status.
Stop mode: Under the stop mode, SPI is not available, so the power consumption is
reduced. If SPI is configured as the master equipment, any transmission process
will be stopped, but it can enter the running mode when the waiting mode stops.
Figure 3-5 is the SPI bus sequence chart.
Figure 3-5 SPI Bus Sequence Chart
3.8.2
I2C Bus
3.8.2.1
Description of PINs
I2C is the two-wire bus for the communication between ICs, which supports any IC
process (NMOS, CMOS, dual-polarity). The two signal wires, serial data (SDA) and
serial clock (SCL), can transmit information between the connected equipment.
Each equipment is identified by the unique address (such as the micro controller,
storage, LCD driver, audio DAC or keyboard interface). Due to the different
functions of the equipment, it can be used as both the sender and the receiver.
