RM46L450
RM46L850
www.ti.com
SPNS184 –SEPTEMBER 2012
1.3 Description
The RM46Lx50 is a high performance microcontroller family for safety systems. The safety architecture
includes Dual CPUs in lockstep, CPU and Memory Built-In Self Test (BIST) logic, ECC on both the Flash
and the data SRAM, parity on peripheral memories, and loop back capability on peripheral IOs.
The RM46Lx50 integrates the ARM® Cortex™-R4F Floating Point CPU which offers an efficient
1.66DMIPS/MHz, and has configurations which can run up to 200MHz providing up to 332 DMIPS. The
device supports the little-endian [LE32] format.
The RM46Lx50 has up to 1.25MB integrated Flash and up to 192KB data RAM configurations with single
bit error correction and double bit error detection. The flash memory on this device is a nonvolatile,
electrically erasable and programmable, implemented with a 64-bit-wide data bus interface. The flash
operates on a 3.3V 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 200MHz. The SRAM
supports single-cycle read/write accesses in byte, halfword, and word modes throughout the supported
frequency range..
The RM46Lx50 device features peripherals for real-time control-based applications, including two Next
Generation High End Timer (N2HET) timing coprocessors with up to 44 total IO terminals, seven
Enhanced PWM (ePWM) modules with up to 14 outputs, six Enhanced Capture Modules (eCAP), two
Enhanced Quadrature Encoders (eQEP) and two 12-bit Analog-to-Digital converters 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. It 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 (HET-TU) can perform DMA type transactions to transfer N2HET data to or from main
memory. A Memory Protection Unit (MPU) is built into the HET-TU.
The enhanced pulse width modulator (ePWM) module is able to generate complex pulse width waveforms
with minimal CPU overhead or intervention. It is easy to use and 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.
The enhanced Capture (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 not needed for capture applications.
The enhanced quadrature encoder pulse (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 two 12-bit-resolution MibADCs with 24 total channels 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. Sixteen channels are shared between the two MibADCs. There are
three separate groups. Each group can be converted once when triggered or configured for continuous
conversion mode.
The device has multiple communication interfaces: three MibSPIs, two SPIs, one LIN, one SCI, three
DCANs, one I2C, one Ethernet, and one USB module.. The SPI provides a convenient method of serial
interaction for 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 2.0B protocol standard and uses a serial,
Copyright © 2012, Texas Instruments Incorporated
RM46Lx50 16/32-Bit RISC Flash Microcontroller
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