Datasheet

SPI
Intel
®
Quark™ microcontroller D2000
Datasheet January 2016
234 Document Number: 333577-002EN
Bits Access
Type
Default Description PowerWell ResetSignal
7 RW/L 1'h0 Serial Clock Polarity
(SCPOL)
Valid when the frame format
(FRF) is set to Motorola SPI*.
Used to select the polarity of
the inactive serial clock,
which is held inactive when
the SPI Controller master is
not actively transferring data
on the serial bus.
0 : Inactive state of serial
clock is low
1 : Inactive state of serial
clock is high
Dependencies: When
SSI_HC_FRF=1, SCPOL bit is
a read-only bit with its value
set by SSI_DFLT_SCPOL.
6 RW/L 1'h0 Serial Clock Phase (SCPH)
Valid when the frame format
(FRF) is set to Motorola SPI*.
The serial clock phase selects
the relationship of the serial
clock with the slave select
signal. When SCPH = 0, data
are captured on the first edge
of the serial clock. When
SCPH = 1, the serial clock
starts toggling one cycle after
the slave select line is
activated, and data are
captured on the second edge
of the serial clock.
0: Serial clock toggles in
middle of first data bit
1: Serial clock toggles at
start of first data bit
Dependencies: When
SSI_HC_FRF=1, SCPH bit is a
read-only bit, with its value
set by SSI_DFLT_SCPH.
5:4 RW 2'h0 Frame Format (FRF)
Selects which serial protocol
transfers the data.
b00 – Motorola SPI*
b01 - Texas Instruments
SSP*
b10 - National
Semiconductors Microwire*
b11 – Reserved