ST72521 STMICROELECTRONICS [STMicroelectronics], ST72521 Datasheet - Page 95
ST72521
Manufacturer Part Number
ST72521
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.ST72521.pdf
(211 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ST72521BTC
Manufacturer:
ST
Quantity:
11 000
- Current page: 95 of 211
- Download datasheet (3Mb)
SERIAL PERIPHERAL INTERFACE (Cont’d)
10.5.5.4 Single Master Systems
A typical single master system may be configured,
using an MCU as the master and four MCUs as
slaves (see
The master device selects the individual slave de-
vices by using four pins of a parallel port to control
the four SS pins of the slave devices.
The SS pins are pulled high during reset since the
master device ports will be forced to be inputs at
that time, thus disabling the slave devices.
Figure 59. Single Master / Multiple Slave Configuration
5V
Figure
MOSI
SCK
SS
SCK
MOSI
Master
MCU
MCU
59).
Slave
MISO
MISO
SS
MOSI
SCK
Slave
MCU
MISO
SS
Note: To prevent a bus conflict on the MISO line
the master allows only one active slave device
during a transmission.
For more security, the slave device may respond
to the master with the received data byte. Then the
master will receive the previous byte back from the
slave device if all MISO and MOSI pins are con-
nected and the slave has not written to its SPIDR
register.
Other transmission security methods can use
ports for handshake lines or data bytes with com-
mand fields.
MOSI
SCK
Slave
MCU
MISO
SS
MOSI
SCK
MCU
Slave
MISO
SS
ST72521
95/211
Related parts for ST72521
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
THYRISTORS
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
ADJUSTABLE INVERTING NEGATIVE OUTPUT CURRENT MODE PWM REGULATORS
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
0.25A SCRs
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
0.8A SCRs
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
Smartcard MCU With 4 additional I/0
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
SERIAL 2K (256 x 8) EEPROM
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
Search -----> STP10NB50FP
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
Search ---> STP12NB30
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
Search -----> STP13NK50Z
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
(MSS40 / MSS50) BACK TO BACK SCR MODULE
Manufacturer:
ST Microelectronics
Datasheet:
Part Number:
Description:
Dmos Programmable High Speed Unipolar Stepper Motor Driver
Manufacturer:
ST Microelectronics, Inc.
Datasheet:
Part Number:
Description:
LOW Votage Telephone Speech Circuit
Manufacturer:
ST Microelectronics, Inc.
Datasheet:
Part Number:
Description:
Technical Article
Manufacturer:
ST Microelectronics, Inc.
Datasheet:
Part Number:
Description:
Thyristormodule
Manufacturer:
ST Microelectronics, Inc.
Datasheet:
Part Number:
Description:
SCR
Manufacturer:
ST Microelectronics
Datasheet: