Filter
Top Products
198
1745D–ATARM–04-Nov-05
AT91M55800A
20.7.4 SPI Transmit Data Register
Register Name: SP_TDR
Access Type: Write-only
Offset: 0x0C
• TD: Transmit Data (Code Label SP_TD)
Data which is to be transmitted by the SPI Interface is stored in this register. Information to be transmitted must be written
to the transmit data register in a right-justified format.
• PCS: Peripheral Chip Select
This field is only used if Variable Peripheral Select is active (PS = 1) and if the SPI is in Master Mode.
If PCSDEC = 0:
PCS = xxx0NPCS[3:0] = 1110
PCS = xx01NPCS[3:0] = 1101
PCS = x011NPCS[3:0] = 1011
PCS = 0111NPCS[3:0] = 0111
PCS = 1111forbidden (no peripheral is selected)
(x = don’t care)
If PCSDEC = 1:
NPCS[3:0] output signals = PCS.
31 30 29 28 27 26 25 24
– – – – – – – –
23 22 21 20 19 18 17 16
– – – –
PCS
15 14 13 12 11 10 9 8
TD
7 6 5 4 3 2 1 0
TD