ST90R158 datasheet(135/190 Pages) STMICROELECTRONICS

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ST90158 - SERIAL PERIPHERAL INTERFACE (SPI)

SERIAL PERIPHERAL INTERFACE (Cont’d)

Table 26. Typical I2C-bus Sequences

Figure 68. SPI Data and Clock Timing (for I2C protocol)

Phase

Software

Hardware

Notes

INITIA LIZE

SPICR.CPOL, CPHA = 0, 0

SPICR.SPEN = 0

SPICR.BMS = 1

SCK pin set as AF output

SDI pin set as input

Set SDO port bit to 1

SCK, SDO in HI-Z

SCL, SDA = 1, 1

Set polarity and phase

SPI disable

START/STO P interrupt

Enable

START

SDO pin set as output

Open Drain

Set SDO port bit to 0

SDA = 0, SCL = 1

interrupt request

START condition

receiver START detection

TRANSMISSION

SPICR.SPEN = 1

SDO pin as Alternate Func-

tion output load data into

SPIDR

SCL = 0

Start transmission

Interrupt request at end of

byte transmission

Managed by interrupt rou-

tine load FFh when receiv-

ing end of transmission

detection

ACKNOWLEDGE

SPICR.SPEN = 0

Poll SDA line

Set SDA line

SPICR.SPEN = 1

SCK, SDO in HI-Z

SCL, SDA = 1

SCL = 0

SPI disable

only if transmitting

only if receiving

only if transmitting

STOP

SDO pin set as output

Open Drain

SPICR.SPEN = 0

Set SDO port bit to 1

SDA = 1

interrupt request

STOP condition

SDA

SCL

START

CONDITION

1st BYTE

AcK

CLOCK PULSE

FOR ACKNOWLEDGEMENT

DRIVEN BY SOFTWARE

DRIVEN BY SW

FOR ACKNOWLEDGEMENT

CLOCK PULSE

CONDITION

STOP

AcK

n BYTE

VR000188

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