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ZHCSTD4B September 2019 – October 2023 BQ75614-Q1

PRODUCTION DATA

封裝選項

機械數(shù)據(jù) (封裝 | 引腳)

PAP|64
- MPQF071C

散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)

PAP|64
- PPTD012N

訂購信息

8.3.6.1.3 SPI Master

The GPIO4 thru GPIO7 are configurable as a SPI master interface when GPIO_CONF1[SPI_EN] = 1. The SPI master includes four I/Os:

SCLK: SPI clock, generated by the device and is used for synchronization
MOSI: Master data output, driven by the device to output data to slave
MISO: Master data input, detecting data from slave
SS: slave select, driven by the device during SPI communication.

The SPI_CONF[CPOL] (clock polarity) and [CPHA] (clock phase) define the SPI clock format. The [CPOL] is defined if the SPI clock is inverted or non-inverted. The [CPHA] is defined if the MISO and MOSI are sampled on the leading (first) clock edge or on the trailing (second) clock edge, regardless of whether that clock edge is rising or falling. The SPI_CONF[NUMBIT4:0] defines how many bits the transaction is (1-bit to 24-bit transaction).

Figure 8-28 SPI Master CPOL and CPHA

Figure 8-29 SPI Master Timing Diagram

Table 8-15 Write to External SPI Slave

Step	Description
1	Configure the SPI clock polarity, clock phase, number of bit transactions: a. Write to SPI_CONF register to configure SPI communication
2	Write the data (from 1 to 24 bits, specified in the SPI_CONF[NUMBIT4:0] setting): a. Set up the data to send to SPI slave to the SPI_TX1 to SPI_TX3 registers b. SPI_TX1 is the LSByte and SPI_TX3 is MSByte
3	Select the slave (assuming active low) and execute the SPI write action: a. Send SPI_EXE register = 0x01 (that is, [SS_CTRL] = 0 and [SPI_GO] = 1)
4	Wait for the SPI communication to complete
5	Deselect the SS port (assuming active low, so deselecting means pull the SS pin high): a. Send SPI_EXE register = 0x02 (that is, [SS_CTRL] = 1 and [SPI_GO] = 0)

Table 8-16 Read from External SPI Slave

Step	Description
1	Configure the SPI clock polarity, clock phase, number of bit transactions: a. Write to SPI_CONF register to configure SPI communication
2	Select the slave and execute the SPI communication: a. Send SPI_EXE register = 0x01 (that is, [SS_CTRL] = 0 and [SPI_GO] = 1)
3	Wait for the data transaction to complete
4	Read the data (from 1 to 24 bits, specified in the SPI_CONF[NUMBIT4:0] setting): a. Read data from SPI slave from the SPI_RX1 to SPI_RX3 registers b. SPI_TX1 is the LSByte and SPI_TX3 is MSByte
5	Deselect the SS port (assuming active low, so deselecting means pull the SS pin high): a. Send SPI_EXE register = 0x02 (that is, [SS_CTRL] = 1 and [SPI_GO] = 0)