PC87570 datasheet(3/168 Pages) NSC

3 / 168 page

Highlights

www.national.com

• MFT16

— Two 16-bit timers

— Each timer supports Pulse Width Modulator (PWM),

Capture and Counter capabilities

• TWD

— 16-bit periodic interrupt timer with 30-

µs resolution

and 5-bit prescaler, for system tick and periodic

wake-up tasks

— 8-bit WATCHDOG timer

• ADC

— Eight channels, 8-bit resolution

— 10

µs conversion/channel

— Internal or external voltage reference

• DAC

— Four channels, 8-bit resolution

— 1

µs conversion time for 50 pF load

— Full output range from AGND to AVCC

• Supports Microsoft Advanced Power Management

(APM) specifications revision 1.2, February 1996

— Generates the System Management Interrupt (SMI)

• 160-pin PQFP and 176-pin TQFP packages

Basic Conﬁguration

Clock

External

Memory

PC87570

32KX1/32KCLKIN

32KX2

HMR

HA18-0

HD7-0

HIOR

HIOW

IRQ1

IRQ11

IRQ12

WR1-0

SEL0

A18-16, A15-0

D15-8

AD7-0

DA3-0

PA6-0

PB7-0

PC7-0

PD7-0

HIOCHRDY

RTC

Battery

VBAT

IRQ8

Crystal

32.768 KHz

External Keyboard

Internal

Keyboard

KBSOUT15-0

KBSIN7-0

SRAM or

Flash

ENV0

GA20

AVCC

AGND

VCC

GND

Power

Supply

SCL

D7-0

HMEMRD

HMEMWR

PG4-0

PE1-0

PF7-0

PH5-0

HMEMCS

HAEN

EXINT0,10,11,15

PFAIL

RING

SHBM

HRMS

Conﬁguration

Inputs

I/O

Expansion

HDEN

TRIS

HPWRON

PC0

External Mouse

Auxiliary PS/2

Interface

HRSTO

SELIO

(Matrix)

SDA

SWIN

Analog

Reset

Control

(power-up reset)

GPIO

Interrupt

ACCESS.bus

System

Timers

ENV1

SEL1

(Application)

VREF

ADC

DAC

PC87570 Datasheet(PDF) 3 Page - National Semiconductor (TI)

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