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VS8053b Datasheet

SPI BUSES

7.4

Serial Protocol for Serial Command Interface (SPI / SCI)

The serial bus protocol for the Serial Command Interface SCI (Chapter 9.5) consists of an

instruction byte, address byte and one 16-bit data word. Each read or write operation can read

or write a single register. Data bits are read at the rising edge, so the user should update data

at the falling edge. Bytes are always send MSb ﬁrst. XCS should be low for the full duration of

the operation, but you can have pauses between bits if needed.

The operation is speciﬁed by an 8-bit instruction opcode. The supported instructions are read

and write. See table below.

Instruction

Name

Opcode

Operation

READ

0b0000 0011

Read data

WRITE

0b0000 0010

Write data

Note: VS8053b sets DREQ low after each SCI operation. The duration depends on the opera-

tion. It is not allowed to ﬁnish a new SCI/SDI operation before DREQ is high again.

7.4.1

SCI Read

10 11 12 13

30 31

14 15 16 17

15 14

instruction (read)

address

data out

XCS

SCK

don’t care

DREQ

execution

Figure 9: SCI word read

VS8053b registers are read from using the following sequence, as shown in Figure 9. First,

XCS line is pulled low to select the device. Then the READ opcode (0x3) is transmitted via

the SI line followed by an 8-bit word address. After the address has been read in, any further

data on SI is ignored by the chip. The 16-bit data corresponding to the received address will be

shifted out onto the SO line.

XCS should be driven high after data has been shifted out.

DREQ is driven low for a short while when in a read operation by the chip. This is a very short

time and doesn’t require special user attention.

Version: 1.31, 2017-11-17

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