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ST92185B Datasheet(PDF) 142 Page - STMicroelectronics

Part # ST92185B
Description  16K/24K/32K ROM HCMOS MCU WITH ON-SCREEN-DISPLAY
PDF  178 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST92185B Datasheet(HTML) 142 Page - STMicroelectronics

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ST92185B - SERIAL PERIPHERAL INTERFACE (SPI)
7.6 SERIAL PERIPHERAL INTERFACE (SPI)
7.6.1 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
7.6.2 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 86. 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



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