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ST90R158 Folha de dados(PDF) 131 Page - STMicroelectronics

Nome de Peças ST90R158
Descrição Electrónicos  8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
PDF  190 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST90R158 Folha de dados(HTML) 131 Page - STMicroelectronics

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ST90158 - SERIAL PERIPHERAL INTERFACE (SPI)
9.4 SERIAL PERIPHERAL INTERFACE (SPI)
9.4.1 Introduction
The Serial Peripheral Interface (SPI) is a general
purpose on-chip shift register peripheral. It allows
communication with external peripherals via an
SPI protocol bus.
In addition, special operating modes allow re-
duced software overhead when implementing I2C-
bus and IM-bus communication standards.
The SPI uses up to 3 pins: Serial Data In (SDI),
Serial Data Out (SDO) and Synchronous Serial
Clock (SCK). Additional I/O pins may act as device
selects or IM-bus address identifier signals.
The main features are:
s
Full duplex synchronous transfer if 3 I/O pins are
used
s
Master operation only
s
4 Programmable bit rates
s
Programmable clock polarity and phase
s
Busy Flag
s
End of transmission interrupt
s
Additional hardware to facilitate more complex
protocols
9.4.2 Device-Specific Options
Depending on the ST9 variant and package type,
the SPI interface signals may not be connected to
separate external pins. Refer to the Peripheral
Configuration Chapter for the device pin-out.
Figure 64. Block Diagram
n
READ BUFFER
SERIAL PERIPHERAL INTERFACE DATA REGISTER
( SPIDR )
POLARITY
PHASE
BAUD RATE
MULTIPLEXER
ST9 INTERRUPT
TRANSMISSION
END OF
SPEN BMS
ARB BUSY CPOL CPHA SPR1 SPR0
DATA BUS
R254
INTCLK
SERIAL PERIPHERAL CONTROL REGISTER ( SPICR )
R253
SDO
SDI SCK/INT2
VR000347
10
INT2
INTERNAL
SERIAL
CLOCK
TO MSPI
CONTROL
LOGIC
INTB0
*
* Common for Transmit and Receive
9



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