TMS470R1VF45AA Datasheet, PDF (4/59 Pages) Texas Instruments – 16/32-BIT RISC FLASH MICROCONTROLLER

TMS470R1VF45AA
16/32-BIT RISC FLASH MICROCONTROLLER
SPNS086A – AUGUST 2003 – REVISED NOVEMBER 2004
description (continued)
The VF45AA device has seven communication interfaces: three SPIs, two SCIs, and two HECCs. The SPI
provides a convenient method of serial interaction for high-speed communications between similar shift-register
type devices. The SCI is a full-duplex, serial I/O interface intended for asynchronous communication between
the CPU and other peripherals using the standard Non-Return-to-Zero (NRZ) format. The HECC uses a serial,
multimaster communication protocol that efficiently supports distributed real-time control with robust
communication rates of up to 1 megabit per second (Mbps). The HECC is ideal for applications operating in
noisy and harsh environments (e.g., automotive and industrial fields) that require reliable serial communication
or multiplexed wiring. For more detailed functional information on the SPI, SCI, and HECC peripherals, see the
specific Reference Guides (literature numbers SPNU195, SPNU196, and SPNU197, respectively).
The HET 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 HET can be used for compare, capture, 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. For more detailed functional information on the HET, see the TMS470R1x High-End Timer (HET)
Reference Guide (literature number SPNU199).
The VF45AA device has a 10-bit-resolution, 16-channel sample-and-hold MibADC. The MibADC channels can
be converted individually or can be grouped by software for sequential conversion sequences. There are three
separate groupings, two of which can be triggered by an external event. Each sequence can be converted once
when triggered or configured for continuous conversion mode. For more detailed functional information on the
MibADC, see the TMS470R1x Multi-Buffered Analog-to-Digital Converter (MibADC) Reference Guide (literature
number SPNU206).
The zero-pin phase-locked loop (ZPLL) clock module contains a phase-locked loop, a clock-monitor circuit, a
clock-enable circuit, and a prescaler (with prescale values of 1–8). The function of the ZPLL is to multiply the
external frequency reference to a higher frequency for internal use. The ZPLL provides ACLK^† to the system
(SYS) module. The SYS module subsequently provides system clock (SYSCLK), real-time interrupt clock
(RTICLK), CPU clock (MCLK), and peripheral interface clock (ICLK) to all other VF45AA device modules. For
more detailed functional information on the ZPLL, see the TMS470R1x Zero-Pin Phase-Locked Loop (ZPLL)
Clock Module Reference Guide (literature number SPNU212).
The VF45AA device also has an external clock prescaler (ECP) module that when enabled, outputs a continuous
external clock (ECLK) on a specified GIO pin. The ECLK frequency is a user-programmable ratio of the pe-
ripheral interface clock (ICLK) frequency. For more detailed functional information on the ECP, see the
TMS470R1x External Clock Prescaler (ECP) Reference Guide (literature number SPNU202).
† ACLK should not be confused with the MibADC internal clock, ADCLK. ACLK is the continuous system clock from an external resonator/crystal
reference.
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