DSPIC30F4013 Microchip Technology Inc., DSPIC30F4013 Datasheet - Page 97

• Manufacturer Part Number: DSPIC30F4013
• Description: Dspic30f3014/4013 High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

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 resynchro-
nized, and all counters/control circuitry are reset.
Therefore, when the SSx pin is asserted low again,
transmission/reception begins at the MSb even if SSx
had been de-asserted in the middle of a transmit/
receive.
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 stop in Sleep mode.
However, register contents are not affected by entering
or exiting Sleep mode.
© 2007 Microchip Technology Inc.
Slave Select Synchronization
SPI Operation During CPU Sleep
Mode
15.5
When the device enters Idle mode, all clock sources
remain functional. The SPISIDL bit (SPIxSTAT<13>)
determines if the SPI module stops or continues on
Idle. If SPISIDL = 0, the module continues to operate
when the CPU enters Idle mode. If SPISIDL = 1, the
module stops when the CPU enters Idle mode.
dsPIC30F3014/4013
SPI Operation During CPU Idle
Mode
DS70138E-page 95