is a high-performance
automotive-grade microcontroller family for safety systems. The safety architecture includes
dual CPUs in lockstep, CPU and memory BIST logic, ECC on both the flash and the data SRAM, parity
on peripheral memories, and loopback capability on peripheral I/Os.
integrates the ARM Cortex-R4F
CPU which offers an efficient 1.66 DMIPS/MHz, and
has configurations which
can run up to 180 MHz providing
up to 298 DMIPS.
device supports the word-invariant big-endian [BE32] format.
has 1.25MB of integrated
flash and 192KB of data RAM with single-bit error correction and
double-bit error detection. The flash memory on this device is a
nonvolatile, electrically erasable and
programmable memory, implemented with a 64-bit-wide data bus
interface. The flash operates on a
3.3-V supply input (same level as I/O supply) for all read, program,
and erase operations. When in
pipeline mode, the flash operates with a system clock frequency of
up to 180 MHz. The SRAM
supports single-cycle read and write accesses in byte, halfword,
word, and double-word modes
throughout the supported frequency range.
features peripherals for real-time control-based applications, including
two Next Generation High-End Timer (N2HET) timing
with up to 44 I/O terminals, seven Enhanced Pulse Width Modulator (ePWM) modules with up to 14
outputs, six Enhanced Capture (eCAP) modules, two Enhanced Quadrature Encoder Pulse (eQEP) modules,
and two 12-bit Analog-to-Digital Converters (ADCs) supporting up to 24 inputs.
The N2HET is an advanced intelligent timer that provides sophisticated timing functions
for real-time applications. The timer is software-controlled, using a reduced instruction set, with
a specialized timer micromachine and an attached I/O port. The N2HET can be used for
pulse-width-modulated outputs, capture or compare inputs, or general-purpose I/O (GIO). The N2HET
is especially well suited for applications requiring multiple sensor information and drive
actuators with complex and accurate time pulses. A High-End Timer Transfer Unit (HTU) can perform
DMA-type transactions to transfer N2HET data to or from main memory. A Memory Protection Unit (MPU)
is built into the HTU.
ePWM module can generate complex pulse width waveforms with minimal CPU overhead or intervention.
The ePWM is easy to use and it supports both high-side and low-side PWM and deadband generation.
With integrated trip zone protection and synchronization with the on-chip MibADC, the ePWM module
is ideal for digital motor control applications.
eCAP module is essential in systems where the accurately timed capture of external events is
important. The eCAP can also be used to monitor the ePWM outputs or for simple PWM generation when
the eCAP is not needed for capture applications.
eQEP module is used for direct interface with a linear or rotary incremental encoder to get
position, direction, and speed information from a rotating machine as used in high-performance
motion and position-control systems.
The device has
24 total inputs and 64 words
of parity-protected buffer RAM each. The MibADC channels can be converted individually or can be
grouped by software for sequential conversion sequences.
inputs are shared between the two MibADCs. Each MibADC supports three separate groupings of
channels. Each group can be converted once when triggered or configured for continuous conversion
The MibADC has a 10-bit mode for use when compatibility with older devices or faster conversion
time is desired.
MibADC1 also supports the use of external analog multiplexers.
The device has multiple communication interfaces:
SPIs, one LIN,
SCI, three DCANs,
one Ethernet, and one FlexRay controller
with two channels. The SPI
provides a convenient method of serial high-speed communications
between similar shift-register
type devices. The LIN supports the Local Interconnect standard 2.0
and can be used as a UART in
full-duplex mode using the standard Non-Return-to-Zero (NRZ) format.
The DCAN supports the CAN 2.0
(A and B) protocol standard and uses a serial, multimaster
communication protocol that efficiently
supports distributed real-time control with robust communication
rates of up to 1 Mbps. The DCAN is
ideal for systems operating in noisy and harsh environments (for
example, automotive and industrial
fields) that require reliable serial communication or multiplexed
wiring. The FlexRay controller uses
a dual-channel serial, fixed time base multimaster communication
protocol with communication rates
of 10 Mbps per channel. A FlexRay Transfer Unit (FTU) enables
autonomous transfers of FlexRay data
to and from main CPU memory. Transfers are protected by a dedicated,
built-in MPU. The Ethernet module supports MII, RMII, and
I2C module is a multimaster communication module providing an interface between the microcontroller
and an I2C-compatible device through the I2C
serial bus. The I2C supports speeds of 100 and 400 Kbps.
A Frequency-Modulated Phase-Locked Loop (FMPLL) clock module is used to multiply the
external frequency reference to a higher frequency for internal use.
The Global Clock Module (GCM) manages the mapping between the available clock sources and the
device clock domains.
The device also has an External Clock Prescaler (ECP) module that when enabled, outputs
a continuous external clock on the ECLK terminal. The ECLK frequency is a user-programmable ratio
of the peripheral interface clock (VCLK) frequency. This low-frequency output can be monitored
externally as an indicator of the device operating frequency.
The Direct Memory Access (DMA) controller has 16 channels, 32 control packets, and
parity protection on its memory. An MPU is built into the DMA to protect memory against erroneous
The Error Signaling Module (ESM) monitors all device errors and determines whether an
interrupt or external error pin (ball) is triggered when a fault is detected. The nERROR terminal
can be monitored externally as an indicator of a fault condition in the microcontroller.
External Memory Interface (EMIF) provides a memory extension to asynchronous and synchronous
memories or other slave devices.
Parameter Overlay Module (POM) enhances the calibration capabilities of application code. The POM
can reroute flash accesses to internal memory or to the EMIF, thus avoiding the reprogramming steps
necessary for parameter updates in flash.
With integrated safety features and a wide choice of communication and control
peripherals, the TMS570LS1227
is an ideal solution for high-performance real-time control applications with safety-critical
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