Mode Control Register - VersaLogic EBX-22 Reference Manual

Mode Control Register

MODCON (Read/Write) 1DFh
D7
Reserved
This register is used to set the mode of the analog input, digital I/O, and SPI interfaces.
Bit Mnemonic
D7 –
D6-D5 SPI
D4-D3 DIO
D2 –
D1-D0 ADC
EBX-22 Reference Manual
D6 D5 D4
SPI1 SPI0 DIO1
Table 44: MODCON Register Bit Assignments
Description
Reserved – This bit has no function.
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.
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.
Reserved – This bit has no function.
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.
D3 D2 D1
DIO0 Reserved ADC1
Special Registers
D0
ADC0
76