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ST90135 датащи(PDF) 135 Page - STMicroelectronics

номер детали ST90135
подробное описание детали  8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
PDF  190 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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ST90135 датащи(HTML) 135 Page - 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)
n
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
12
8
9
1st BYTE
AcK
CLOCK PULSE
FOR ACKNOWLEDGEMENT
DRIVEN BY SOFTWARE
12
8
9
DRIVEN BY SW
FOR ACKNOWLEDGEMENT
CLOCK PULSE
CONDITION
STOP
AcK
n BYTE
th
VR000188
9



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