TMS320F28027 Datasheet, PDF (28/130 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
SPRS523F – NOVEMBER 2008 – REVISED DECEMBER 2010
www.ti.com
3.3.17 General-Purpose Input/Output (GPIO) Multiplexer
Most of the peripheral signals are multiplexed with general-purpose input/output (GPIO) signals. This
enables the user to use a pin as GPIO if the peripheral signal or function is not used. On reset, GPIO pins
are configured as inputs. The user can individually program each pin for GPIO mode or peripheral signal
mode. For specific inputs, the user can also select the number of input qualification cycles. This is to filter
unwanted noise glitches. The GPIO signals can also be used to bring the device out of specific low-power
modes.
3.3.18 32-Bit CPU-Timers (0, 1, 2)
CPU-Timers 0, 1, and 2 are identical 32-bit timers with presettable periods and with 16-bit clock
prescaling. The timers have a 32-bit count-down register, which generates an interrupt when the counter
reaches zero. The counter is decremented at the CPU clock speed divided by the prescale value setting.
When the counter reaches zero, it is automatically reloaded with a 32-bit period value.
CPU-Timer 0 is for general use and is connected to the PIE block. CPU-Timer 1 is also for general use
and can be connected to INT13 of the CPU. CPU-Timer 2 is reserved for DSP/BIOS. It is connected to
INT14 of the CPU. If DSP/BIOS is not being used, CPU-Timer 2 is available for general use.
CPU-Timer 2 can be clocked by any one of the following:
• SYSCLKOUT (default)
• Internal zero-pin oscillator 1 (INTOSC1)
• Internal zero-pin oscillator 2 (INTSOC2)
• External clock source
3.3.19 Control Peripherals
The devices support the following peripherals that are used for embedded control and communication:
ePWM:
eCAP:
ADC:
Comparator:
The enhanced PWM peripheral supports independent/complementary PWM
generation, adjustable dead-band generation for leading/trailing edges,
latched/cycle-by-cycle trip mechanism. Some of the PWM pins support the
HRPWM high resolution duty and period features. The type 1 module found on
2802x devices also supports increased dead-band resolution, enhanced SOC and
interrupt generation, and advanced triggering including trip functions based on
comparator outputs.
The enhanced capture peripheral uses a 32-bit time base and registers up to four
programmable events in continuous/one-shot capture modes.
This peripheral can also be configured to generate an auxiliary PWM signal.
The ADC block is a 12-bit converter. It has up to 13 single-ended channels pinned
out, depending on the device. It contains two sample-and-hold units for
simultaneous sampling.
Each comparator block consists of one analog comparator along with an internal
10-bit reference for supplying one input of the comparator.
28
Functional Overview
Copyright © 2008–2010, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): TMS320F28027 TMS320F28026 TMS320F28023 TMS320F28022 TMS320F28021
TMS320F28020 TMS320F280200