Hi Phil,
One other consideration with respect to what Chris has stated as you are using the pulsed command instead of the START pin. There is a setup time required for CS going low and the first edge of SCLK. This is shown on page 7 of the datasheet in the timing characteristics table noted as tsssc.
When I have coded in the past there is usually enough time in changing the port pin to writing to the SPI transmit buffer that I have never had a problem meeting this requirement.
Best regards,
Bob B