Datasheet

To COMPy A or B input
To ADC Channel X
1
0
AIOx Pin
AIOxIN
AIOxINE
SYNC
SYSCLK
Logic implemented in GPIO MUX block
AIODAT Reg
(Read)
AIODAT Reg
(Latch)
AIOSET,
AIOCLEAR,
AIOTOGGLE
Regs
AIOMUX 1 Reg
1
0
AIOxDIR
(1 = Input,
0 = Output)
(0 = Input, 1 = Output)
AIODIR Reg
(Latch)
0
TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
SPRS523J –NOVEMBER 2008–REVISED OCTOBER 2013 www.ti.com
4.1.2 ADC MUX
Figure 4-3. AIOx Pin Multiplexing
The ADC channel and Comparator functions are always available. The digital I/O function is available only
when the respective bit in the AIOMUX1 register is 0. In this mode, reading the AIODAT register reflects
the actual pin state.
The digital I/O function is disabled when the respective bit in the AIOMUX1 register is 1. In this mode,
reading the AIODAT register reflects the output latch of the AIODAT register and the input digital I/O buffer
is disabled to prevent analog signals from generating noise.
On reset, the digital function is disabled. If the pin is used as an analog input, users should keep the AIO
function disabled for that pin.
52 Peripherals Copyright © 2008–2013, Texas Instruments Incorporated
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TMS320F28020 TMS320F280200