PC87782 datasheet(2/17 Pages) NSC

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General Description (continued)

Each PC87782 device has 16 kbytes of mask-programmed

ROM, 2,784 bytes of on-chip static RAM, a Host Interface, a

LAN Interface, a System Management (Access.bus) Inter-

face, a fan-speed timer, an A/D converter, a D/A converter,

WATCHDOG protection, and a set of general-purpose I/O

pins.

The PC87782 is available in 100-pin and 160-pin PQFP

packages. The 160-pin device provides development sup-

port and offers the additional ability to use off-chip memory

and I/O.

The PC87782 device is driven by a slow (32.768 kHz) oscil-

lator. An on-chip clock circuit generates a high-speed clock

to drive the device for normal operation, at a programmable

rate ranging from 4 MHz to 20 MHz. The device supports a

power save mode called the Idle mode, which is combined

with multi-source interrupt and wake-up capabilities.

Features (continued)

s I/O Features

— Up to 40 general-purpose I/O pins (shared with on-chip

peripheral I/O pins)

— Programmable I/O pin characteristics: TRI-STATE®

output, push-pull output, weak pull-up input, high-im-

pedance input

— Schmitt trigger inputs on all I/O ports

— External memory and I/O support in 160-pin device

s Power Supply

— 4.5V to 5.5V single-supply operation

s Temperature Range

— -40

°C to +85°C extended temperature range

s Package Types

— 160-pin PQFP

— 100-pin PQFP

s Development Support

— Real-time emulation and full program debug capabili-

ties supported by 160-pin device

— CompactRISC tool set provides C programming and

debugging support

PC87782 Datasheet(PDF) 2 Page - National Semiconductor (TI)