PC87591L datasheet(4/437 Pages) NSC

4 / 437 page

www.national.com

Revision 1.07

Features (Continued)

❏

15 IRQ routing options

■

Legacy free support

■

Real-Time Clock (RTC)

— DS1287 and MC146818 compatible

— 242-byte battery backed-up CMOS RAM

— Calendar including century and automatic leap-year

adjustment (Y2K compliant)

— Optional adjustment for daylight saving time

— BCD or binary format for timekeeping

— Three individually maskable interrupt event ﬂags:

periodic rates from 122

µs to 500 ms; time-of-day

alarm, once-per-second to once-per-day

— Double-buffer time registers

— Alarm wake-up

■

Mobile System Wake-Up Control (MSWC)

— Wake-up on detection of RI1, RI2, RING activity

❏

External modem ring on serial port

❏

Ring pulse or pulse train on RING input signal

❏

Software-controlled off events

— Optional routing of power-up request on IRQ and/or

SMI lines

Clocking, Supply and Package Information

■

Strap Input Controlled Operating Modes

— Turn on shared BIOS

— TRI-STATE

— Development

— On-board development

— Programing environment

■

Clocks

— Single 32.768 KHz crystal oscillator

— LPC clock, up to 33 MHz

— On-chip high frequency clock generator

❏

CPU clock 4-20 MHz

❏

Software-controlled frequency generation

❏

Multiplier source 32 KHz input

— 32 KHz clock out

— CR16B clock out

■

Power Supply

— 3.3V supply operation

— 5V tolerance and back-drive protection on all pins

(except LPC bus pins and keyboard scan inputs)

— Separate supply for Host I/F (VDD) and Embedded

Controller functions (VCC)

— Backup battery input for RTC, and wake-up conﬁgu-

ration.

— Reduced power consumption capability

— Four power modes, switched by software or hard-

ware

❏

Active mode current (TBD mA)

❏

Active mode executing WAIT

❏

Idle (15

µA)

❏

Power off for RTC only (0.9

µA typical) from

backup battery

— Automatic wake-up on system events

■

Package Options

— 128-pin LQFP package

— 176-pin LQFP package for more GPIO pins, Expan-

sion Memory use and development systems

PC87591L 数据表(PDF) 4 Page - National Semiconductor (TI)

PC87591L 数据表(HTML) 4 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载