Special Registers
EBX-22 Reference Manual
76
Mode Control Register
MODCON (Read/Write) 1DFh
D7 D6 D5 D4 D3 D2 D1 D0
Reserved SPI1
SPI0
DIO1 DIO0 Reserved ADC1 ADC0
This register is used to set the mode of the analog input, digital I/O, and SPI interfaces.
Table 44: MODCON Register Bit Assignments
Bit Mnemonic
Description
D7 –
Reserved
– This bit has no function.
D6-D5 SPI
SPI Mode Control
– These bits set the mode of the general purpose I/O
function.
D6 D5
Mode
0
0
Use register 1D7h to “bit bang” individual bits.
0
1
Legacy EBX-11 SPI interface using registers 1D8h-1DDh (reset
default).
1
0
Reserved – do not use.
1
1
Reserved – do not use.
D4-D3 DIO
DIO Mode Control
– These bits set the mode of the digital I/O function.
D4 D3
Mode
0
0
Use register 1D6h to “bit bang” individual bits.
0
1
Legacy EBX-11 SPI interface using registers 1D8h-1DDh (reset
default).
1
0
Reserved – do not use.
1
1
Reserved – do not use.
D2 –
Reserved
– This bit has no function.
D1-D0 ADC
Analog Input Mode Control
– These bits set the mode of the analog input
function.
D1 D0
Mode
0
0
Use register 1D5h to “bit bang” individual bits.
0
1
Legacy EBX-11 SPI interface using registers 1D8h-1DDh (reset
default).
1
0
ADC state machine continuously updates eight 16-bit registers.
1
1
Reserved – do not use.
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