SN260 datasheet(26/88 Pages) STMICROELECTRONICS

26 / 88 page

SPI protocol

SN260

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Figure 6.

SPI protocol timing waveform

Table 14 lists the timing parameters of the SPI protocol. These parameters are illustrated in

Figure 6.

6.4

Data format

The data format, also referred to as a command, is the same for both the Command section

and the Response section. The data format of the SPI Protocol is straightforward, as

illustrated in Figure 7.

Figure 7.

SPI protocol data format

The total length of a command must not exceed 128 bytes.

All commands must begin with the SPI Byte. Some commands are only two bytes—that is,

they contain the SPI Byte and Frame Terminator only.

Table 14.

SPI protocol timing parameters

Parameter

Description

Min.

Typ.

Max.

Unit

t1 (a)

Wake handshake, while 260 is awake

133

150

t1 (b)

Wake handshake, while 260 is asleep

7.3

Wake handshake finish

1.1

1.2

Reset pulse width

Startup time

250

1500

nHOST_INT de-asserting after Command

Clock rate

200

Wait section

755

200000

nHOST_INT de-asserting after Response

130

800

nHOST_INT asserting after transaction

800

t10

Inter-command spacing

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