AM652X datasheet(251/277 Pages) TI1

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251

AM6548, AM6528, AM6546

AM6526, AM6527

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SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Detailed Description

The Real Time Interrupt module provides timer functionality for operating systems and for benchmarking

code. The module incorporates several counters, which define the timebases needed for scheduling in the

operating system.

This module is specifically designed to fulfill the requirements for OSEK (“Offene Systeme und deren

Schnittstellen für die Elektronik im Kraftfahrzeug”; “Open Systems and the Corresponding Interfaces for

Automotive Electronics”) as well as OSEK/Time compliant operating systems.

The timers also provide the ability to benchmark certain areas of code by reading the counter contents at

the beginning and the end of the desired code range and calculating the difference between the values.

For more information, see Real Time Interrupt (RTI) Module section in the device TRM.

6.4.5.25 Timers

There are sixteen timer modules in the device.

All timers include specific functions to generate accurate tick interrupts to the operating system.

Each timer can be clocked from several different independent clocks. The selection of clock source is

made from registers in the MCU_CTRL_MMR0/CTRL_MMR0.

In the MCU domain the device provides 2 timer pins to be used as MCU Timer Capture inputs or as MCU

Timer PWM outputs. In order to provide maximum flexibility, these 2 pins may be used with any of

MCU_TIMER0 through MCU_TIMER3 instances. System level muxes are used to control the capture

source pin for each MCU_TIMER[3-0] and the MCU_TIMER[3-0] source for each MCU_TIMER_IO[1-0]

PWM output

In the MAIN domain the device provides 8 timer pins to be used as Timer Capture inputs or as Timer

PWM outputs. For maximum flexibility, these 8 pins may be used with any of TIMER0 through TIMER11

instances. System level muxes are used to control the capture source pin for each TIMER[11-0] and the

TIMER[11-0] source for each TIMER_IO[7-0] PWM output.

For more information, see Timers section in the device TRM.

6.4.5.26 UART

The UART is a slave peripheral that utilizes the DMA for data transfer or interrupt polling via host CPU.

There are five UART modules in the device. All UART modules support IrDA and CIR modes when 48

MHz function clock is used. Each UART can be used for configuration and data exchange with a number

of external peripheral devices or interprocessor communication between devices.

The CIR mode uses a variable pulse-width modulation (PWM) technique (based on multiples of a

programmable t period) to encompass the various formats of infrared encoding for remote-control

applications. The CIR logic transmits data packets based on a user-definable frame structure and packet

content.

For more information, see Universal Synchronous/Asynchronous Receiver/Transmitter (UART) section in

the device TRM.

6.4.5.27 USB

Similar to earlier versions of USB bus, USB 3.0 is a general-purpose cable bus, supporting data exchange

between a host device and a wide range of simultaneously accessible peripherals.

The device supports two USB subsystems, both instantiated in the MAIN system domain:

•

USB3SS0 is SuperSpeed (SS) USB 3.0 Dual-Role-Device (DRD) subsystem with integrated SS

(USB3.0) PHY and HS/FS/LS (USB2.0) PHY

•

USB3SS1 is HighSpeed (HS) USB 2.0 Dual-Role-Device (DRD) subsystem with integrated HS/FS/LS

(USB2.0) PHY

For more information, see Universal Serial Bus (USB) Subsystem section in the device TRM.

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