MCIMX255AJM4A(2010) 查看數據表（PDF） - Freescale Semiconductor

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MCIMX255AJM4A
(Rev.:2010)

i.MX25 Applications Processor for Automotive Products

Freescale Semiconductor 

Table 3. i.MX25 Digital and Analog Modules (continued)

Block

Mnemonic

I2C(3)

IIM

IOMUX

KPP

LCDC

MAX

PWM(4)

SDMA

SIM(2)

SJC

SLCD

SPBA

Block Name Subsystem

Brief Description

I2C module

Connectivity

peripherals

Inter-IC Communication (I2C) is an industry-standard, bidirectional serial bus

that provides a simple, efficient method of data exchange, minimizing the

interconnection between devices. I2C is suitable for applications requiring

occasional communications over a short distance between many devices.

The interface operates up to 100 kbps with maximum bus loading and timing.

The I2C system is a true multiple-master bus, including arbitration and

collision detection that prevents data corruption if multiple devices attempt to

control the bus simultaneously. This feature supports complex applications

with multiprocessor control and can be used for rapid testing and alignment

of end products through external connections to an assembly-line computer.

IC

Security

Identification

Module

The IIM provides the primary user-visible mechanism for interfacing with

on-chip fuse elements. Among the uses for the fuses are unique chip

identifiers, mask revision numbers, cryptographic keys, and various control

signals requiring a fixed value.

I/O multiplexer Pins

Each I/O multiplexer provides a flexible, scalable multiplexing solution:

• Up to eight output sources multiplexed per pin

• Up to four destinations for each input pin

• Unselected input paths are held at constant level for reduced power

consumption

Keypad port Connectivity

peripherals

KPP can be used for either keypad matrix scanning or general purpose I/O.

LCD

Controller

Multimedia

peripherals

LCDC provides display data for external gray-scale or color LCD panels.

LCDC is capable of supporting black-and-white, gray-scale, passive-matrix

color (passive color or CSTN), and active-matrix color (active color or TFT)

LCD panels.

ARM platform ARM platform

multilayer

AHB crossbar

switch

MAX concurrently supports up to five simultaneous connections between

master ports and slave ports. MAX allows for concurrent transactions to

occur from any master port to any slave port.

Pulse width Connectivity

modulation peripherals

The Pulse-Width Modulator (PWM) has a 16-bit counter and is optimized to

generate sound from stored sample audio images. It can also generate

tones. The PWM uses 16-bit resolution and a 4x16 data FIFO to generate

sound.

Smart DMA System control The SDMA provides DMA capabilities inside the processor. It is a shared

engine

module that implements 32 DMA channels.

Subscriber

identity

module

interface

Connectivity

peripherals

The SIMv2 is an asynchronous interface with additional features for allowing

communication with smart cards conforming to the ISO/IEC 7816

specification. The SIM is designed to facilitate communication to SIM cards

or pre-paid phone cards.

Secure JTAG System control The System JTAG Controller (SJC) provides debug and test control with

interface

peripherals

maximum security.

Smart LCD Multimedia

controller

peripherals

The SLCDC module transfers data from the display memory buffer to the

external display device.

Shared

System control The SPBA controls access to the shared peripherals. It supports shared

peripheral bus

peripheral ownership and access rights to an owned peripheral.

arbiter

i.MX25 Applications Processor for Automotive Products, Rev. 5

8

Freescale Semiconductor

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