Spi transmit data register – Rainbow Electronics AT75C310 User Manual
Page 111
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AT75C310
111
SPI Transmit Data Register
Register Name:
SP_TDR
Access Type:
Write-only
•
TD: Transmit Data
Data that 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 = xxx0
NPCS[3:0] = 1110
PCS = xx01
NPCS[3:0] = 1101
PCS = x011
NPCS[3:0] = 1011
PCS = 0111 NPCS[3:0] = 0111
PCS = 1111 forbidden (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
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