The init sequence can be shortened like:

        movlw   1<<smp|1<<cke
        movwf   sspstat
        movlw   1<<sspen|1<<ckp
        movwf   sspcon

The output routine should check if the previous byte has been shifted out
(but in your particular case the SPI clock is fast enough and so it is
unlikely that you manage somehow to overwrite previous data).

        bcf     status, rp0     ; specify Bank0
        btfss   pir1,sspif
        goto    $-1
        movf    txdata, w       ; w reg holds contents of txdata
        movwf   sspbuf          ; new data to xmit
        bcf     pir1,sspif

Josef

>;  Initialize SPI registers
>
>SPI Initial
>        bcf     TRISC, 5                        ; Enable SDO
>        bcf     TRISC, 3                        ; SCK in Master mode
>        bsf     SSPCON, SSPEN   ; enable synchronous serial port
>        bsf     SSPCON, CKP             ; SCK will idle high
>        bcf     SSPCON, SSPM3   ; last 4 bits of SSPCON clear for SPI
master mode with
>SCK = Fosc / 4
>        bcf     SSPCON, SSPM2
>        bcf     SSPCON, SSPM1
>        bcf     SSPCON, SSPM0
>        bcf     SSPCON, WCOL
>        bcf     SSPCON, SSPOV
>        bsf     SSPSTAT, SMP    ; input data sampled at end of output line
>        bsf     SSPSTST, CKE            ; CPK = 1 and data transmitted on
falling edge of SCK
>        retrun
>
>Now to perform a write to the SPI bus is all I have to do is this? (where
>txdata is the 8 bit word I want to write)
>
>bcf             status, rp0     ; specify Bank0
>movf            txdata, w       ; w reg holds contents of txdata
>movwf           sspbuf          ; new data to xmit