Chapter 3
104
••••
Peripheral Control
eSL/eSLS Series (+ eSLZ000) User’s Manual
3.8 Serial Peripheral Interface
(eSL and eSLZ000 only)
3.8.1 Features
4 external pins:
MOSI, MISO, SCK, and /SS. All four pins can be used as GPIO if the SPI
module is disabled (SPIEN = 0).
Two operational modes:
Master and Slave.
Baud rate:
8 different programmable baud rates
Data Word length:
8 or 16 bits. Data must be left aligned when written to the transmit buffer
register. Data read back from receive buffer register is right aligned.
Full duplex:
Simultaneous receive and transmit operation
Clocking:
4 programmable clocking schemes
Interrupt/polling:
Transmit and receive operations are accomplished by either interrupt-driven
or polling.
SPI boot flash (interface) and SPI data flash (interface):
The eSLZ000 supports both SPI boot flash and SPI data flash, while eSL
only supports SPI data flash (see their respective Application Circuits in
Chapter 5).
SPI wake-up:
In SPI slave mode, SCK has wake up functionality in GREEN and SLEEP
modes
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