Microchip Technology ADM00419 User Manual
MCP2210 Breakout Module User’s Guide
DS52056A-page 14
© 2012 Microchip Technology Inc.
A wider range of tests is available when using this board and the utility software with
the MCP2210 Evaluation Kit (ADM00421). This kit allows communication with several
SPI slave devices (I/O expander, EEPROM, ADC and temperature sensor). For more
details on examples using the SPI Terminal Utility software, see MCP2210 Evaluation
Kit User’s Guide (DS52057).
the MCP2210 Evaluation Kit (ADM00421). This kit allows communication with several
SPI slave devices (I/O expander, EEPROM, ADC and temperature sensor). For more
details on examples using the SPI Terminal Utility software, see MCP2210 Evaluation
Kit User’s Guide (DS52057).
2.4
MCP2210 TYPICAL USAGE SCENARIOS
MCP2210 can be used in systems where an SPI bus is available. The MCP2210 can
be either the single master on the bus, or one of the masters sharing the bus, if a proper
master access arbitration scheme is in place.
be either the single master on the bus, or one of the masters sharing the bus, if a proper
master access arbitration scheme is in place.
A typical usage scenario is shown in Figure 2-2, where MCP2210 is the only master on
the SPI bus. This links the SPI slave chips in the system, while a few GPs (configured
for Chip Select function) can be used as Chip Select lines.
the SPI bus. This links the SPI slave chips in the system, while a few GPs (configured
for Chip Select function) can be used as Chip Select lines.
If SPI slave interrupt monitoring is required, the GP6 needs to be configured for its
dedicated function, in order to monitor the interrupts coming from the SPI slave chips.
dedicated function, in order to monitor the interrupts coming from the SPI slave chips.
The PC application will
take care of all the details necessary for data transfer between
the MCP2210 and the SPI slave chips.
FIGURE 2-2:
MCP2210 TYPICAL USAGE DIAGRAM
When a system requires more than one SPI master that share the same bus, an
arbitration scheme needs to be developed, in order to prevent the multiple SPI masters
from accessing the bus at the same time.
arbitration scheme needs to be developed, in order to prevent the multiple SPI masters
from accessing the bus at the same time.
MCP2210 has support for an arbitration mechanism which uses GP7 and GP8
(configured for dedicated pin functionality) for this purpose.
(configured for dedicated pin functionality) for this purpose.
MCP2210
SPI bus
Chip Select lines
MOSI, MISO, SCK
CS0-CS8
USB
USB-to-SPI
bridge
SPI slave chip #1
SPI slave chip #n
External
Interrupt
Interrupt
(GP6)
Interrupt
Interrupt
...