AT89C5132-ROTIL datasheet(12/38 Pages) ATMEL

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AT89C5132

4173CS–USB–07/04

Peripherals

The AT8xC5132 peripherals are briefly described in the following sections. For further

details on how to interface (hardware and software) to these peripherals, please refer to

the AT8xC5132 complete datasheet.

Clock Generator System

The AT8xC5132 internal clocks are extracted from an on-chip PLL fed by an on-chip

oscillator. Four clocks are generated respectively for the C51 core, the audio interface,

and the other peripherals. The C51 and peripheral clocks are derived from the oscillator

clock. The audio interface sample rates are also obtained by dividing the PLL output

clock.

Ports

The AT8xC5132 implement five 8-bit ports (P0 to P4) and one 4-bit port (P5). In addition

to performing general-purpose I/Os, some ports are capable of external data memory

operations; others allow for alternate functions. All I/O Ports are bidirectional. Each Port

contains a latch, an output driver and an input buffer. Port 0 and Port 2 output drivers

and input buffers facilitate external memory operations. Some Port 1, Port 3 and Port 4

pins serve for both general-purpose I/Os and alternate functions.

Timers/Counters

The AT8xC5132 implement the two general-purpose, 16-bit Timers/Counters of a stan-

dard C51. They are identified as Timer 0, Timer 1, and can independently be configured

each to operate in a variety of modes as a Timer or as an event Counter. When operat-

ing as a Timer, a Timer/Counter runs for a programmed length of time, then issues an

interrupt request. When operating as a Counter, a Timer/Counter counts negative transi-

tions on an external pin. After a preset number of counts, the Counter issues an interrupt

request.

Watchdog Timer

The AT8xC5132 implement a hardware Watchdog Timer that automatically resets the

chip if it is allowed to time out. The WDT provides a means of recovering from routines

that do not complete successfully due to software or hardware malfunctions.

Audio Output Interface

The AT8xC5132 implements an audio output interface allowing the decoded audio bit-

stream to be output in various formats. They are compatible with right and left

justification PCM and I2S formats and the on-chip PLL allows connection of almost all

commercial audio DAC families available on the market.

Universal Serial Bus

Interface

The AT8xC5132 implements a full-speed Universal Serial Bus Interface. The USB inter-

face can be used for the following purposes:

•

Download of files by supporting the USB mass storage class.

•

In-System Programming by supporting the USB firmware upgrade class.

MultiMedia Card

Interface

The AT8xC5132 implements a MultiMedia Card (MMC) interface compliant to the V2.2

specification in MultiMedia Card mode. The MMC allows storage of files in removable

Flash memory cards that can be easily plugged or removed from the application. It can

also be used for In-System Programming.

IDE/ATAPI Interface

The AT8xC5132 provide an IDE/ATAPI interface allowing connection of devices such as

CD-ROM reader, CompactFlash™ cards, Hard Disk Drive, etc. It consists of a 16-bit bidi-

rectional bus part of the low-level ANSI ATA/ATAPI specification. It is provided for mass

storage interface but could be used for In-System Programming using CD-ROM.

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