Digi manual Hardware Reference NS9215

SPI module structure	434
SPI controller	434
Simple parallel/serial data conversion	434
Full duplex operation	434
SPI clocking modes	435
Timing modes	435
Clocking mode diagrams	435
SPI clock generation	436
Clock generation samples	436
In SPI master mode	436
In SPI slave mode	436
System boot-over-SPI operation	436
Available strapping options	437
EEPROM/FLASH header	437
Header format	437
Time to completion	438
SPI Control and Status registers	439
Register address map	439
SPI Configuration register	439
Clock Generation register	440
Register programming steps	441
Interrupt Enable register	441
Interrupt Status register	442
SPI timing characteristics	443
SPI master timing diagram	444
SPI slave timing parameters	444
SPI slave timing diagram	445
C h a p t e r 1 3 : I 2 C M a s t e r / S l a v e I n t e r f a c e	447
Overview	447
Physical I2C bus	447
Multi-master bus	448
I2C external addresses	448
I2C command interface	449
Locked interrupt driven mode	449
Master module and slave module commands	449
Bus arbitration	449
I2C registers	450
Register address map	450
Command Transmit Data register	450
Register	450
Register bit assignment	451
Status Receive Data register	451
Register	451

22Hardware Reference NS9215