Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Uživatelský manuál stáhnout pdf (Strana 47)

MAXQ Family User’s Guide:

MAXQ8913 Supplement

11-2

11.2.2 SPI Example 2: Receiving Data in Slave Mode

move SPICN, #01h ; Enable SPI in slave mode

move SPICF, #00h ; Sample data at clock rising edge, 8 bit character

call getByte

move A[0], GR

call getByte

move A[1], GR

call getByte

move A[2], GR

call getByte

move A[3], GR

...

getByte:

move C, SPICN.6 ; Wait for transfer to complete

jump NC, getByte

move SPICN.6, #0 ; Clear transfer flag

move GR, SPIB ; Get character

ret

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Maxim-integrated MAXQ Family Users Guide: MAXQ8913 Supplement Uživatelský manuál Strana 47