TMS320F28027_17 Datasheet, PDF (114/138 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
SPRS523K – NOVEMBER 2008 – REVISED JUNE 2016
www.ti.com
Table 6-52. Analog MUX for 38-Pin DA Package⁽¹⁾
AIOMUX1 REGISTER BITS
1-0
3-2
5-4
7-6
9-8
11-10
13-12
15-14
17-16
19-18
21-20
23-22
25-24
27-26
29-28
31-30
(1) I = Input, O = Output
AIOx AND PERIPHERAL SELECTION 1
AIOMUX1 BITS = 0,x
ADCINA0 (I), V_REFHI (I)
–
AIO2 (I/O)
–
AIO4 (I/O)
–
AIO6 (I/O)
–
–
–
AIO10 (I/O)
–
AIO12 (I/O)
–
AIO14 (I/O)
–
DEFAULT AT RESET
PERIPHERAL SELECTION 2 AND
PERIPHERAL SELECTION 3
AIOMUX1 BITS = 1,x
ADCINA0 (I), V_REFHI (I)
–
ADCINA2 (I), COMP1A (I)
–
ADCINA4 (I)
–
ADCINA6 (I)
–
–
–
ADCINB2 (I), COMP1B (I)
–
ADCINB4 (I)
–
ADCINB6 (I)
–
The user can select the type of input qualification for each GPIO pin via the GPxQSEL1/2 registers from
four choices:
• Synchronization To SYSCLKOUT Only (GPxQSEL1/2 = 0, 0): This is the default mode of all GPIO pins
at reset and it simply synchronizes the input signal to the system clock (SYSCLKOUT).
• Qualification Using Sampling Window (GPxQSEL1/2 = 0, 1 and 1, 0): In this mode the input signal,
after synchronization to the system clock (SYSCLKOUT), is qualified by a specified number of cycles
before the input is allowed to change.
• The sampling period is specified by the QUALPRD bits in the GPxCTRL register and is configurable in
groups of 8 signals. It specifies a multiple of SYSCLKOUT cycles for sampling the input signal. The
sampling window is either 3-samples or 6-samples wide and the output is only changed when ALL
samples are the same (all 0s or all 1s) as shown in Figure 4-18 (for 6 sample mode).
• No Synchronization (GPxQSEL1/2 = 1,1): This mode is used for peripherals where synchronization is
not required (synchronization is performed within the peripheral).
Due to the multilevel multiplexing that is required on the device, there may be cases where a peripheral
input signal can be mapped to more then one GPIO pin. Also, when an input signal is not selected, the
input signal will default to either a 0 or 1 state, depending on the peripheral.
114 Detailed Description
Copyright © 2008–2016, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Links: TMS320F28027 TMS320F28026 TMS320F28023 TMS320F28022 TMS320F28021
TMS320F28020 TMS320F280200