Figure 14-2. Motorola Spi Frame Format (Continuous Transfer) - Sharp LH79524 User Manual

Synchronous Serial Port
14.1.2 Motorola SPI Frame Format
For the Motorola SPI format, the serial frame pin (SSPFRM) is active LOW. The SPO and
SPH bits in SSP Control Register 0 influence SSPCLK and SSPFRM operation in Single
and Continuous Modes.
Figure 14-2 and Figure 14-3 show the Motorola SPI frame format for single data transfers,
continuous data transfers, and when SPH equals 0 or 1.
NOTE: SPH = '0', SPO = '0'.
NOTE: Q = Undefined.
14-4
SSPCLK
SSPFRM
SSPTXD/
LSB
SSSRXD

Figure 14-2. Motorola SPI Frame Format (Continuous Transfer)

SSPCLK
(SPO = 0)
SSPCLK
(SPO = 1)
SSPTX
MSB
(from master)
SSPRX
MSB
(from slave)
SSPFRM
Figure 14-3. Motorola SPI Frame Format with SPH = 0
Version 1.0
MSB
4 to 16 BITS
LH79524/LH79525 User's Guide
LSB
MSB
LSB
LSB Q
LH79525-74
LH79525-75