DSPIC30F2010 MICROCHIP [Microchip Technology], DSPIC30F2010 Datasheet - Page 95

• Manufacturer Part Number: DSPIC30F2010
• Description: High-Performance, 16-Bit Digital Signal Controllers
• Manufacturer: MICROCHIP [Microchip Technology]

15.3
The SSx pin allows a Synchronous Slave mode. The
SPI must be configured in SPI Slave mode, with SSx
pin control enabled (SSEN = 1). When the SSx pin is
low, transmission and reception are enabled, and the
SDOx pin is driven. When SSx pin goes high, the SDOx
pin is no longer driven. Also, the SPI module is re-
synchronized, and all counters/control circuitry are
reset. Therefore, when the SSx pin is asserted low
again, transmission/reception will begin at the MSb,
even if SSx had been de-asserted in the middle of a
transmit/receive.
© 2006 Microchip Technology Inc.
Slave Select Synchronization
15.4
During Sleep mode, the SPI module is shut down. If
the CPU enters Sleep mode while an SPI transaction
is in progress, then the transmission and reception is
aborted.
The transmitter and receiver will stop in Sleep mode.
However, register contents are not affected by
entering or exiting Sleep mode.
15.5
When the device enters Idle mode, all clock sources
remain functional. The SPISIDL bit (SPIxSTAT<13>)
selects if the SPI module will stop or continue on Idle.
If SPISIDL = 0, the module will continue to operate
when the CPU enters Idle mode. If SPISIDL = 1, the
module will stop when the CPU enters Idle mode.
SPI Operation During CPU Sleep
Mode
SPI Operation During CPU Idle
Mode
dsPIC30F2010
DS70118G-page 93