pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 4

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

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Features
Clocking, Supply and Package Information
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
— Optional adjustment for daylight saving time
— BCD or binary format for timekeeping
— Three individually maskable interrupt event flags:
— Double-buffer time registers
— Alarm wake-up
Mobile System Wake-Up Control (MSWC)
— Wake-up on detection of RI1, RI2, RING activity
— Optional routing of power-up request on IRQ and/or
Strap Input Controlled Operating Modes
— Turn on shared BIOS
— TRI-STATE
— Development
— On-board development
— Programing environment
adjustment (Y2K compliant)
periodic rates from 122 s to 500 ms; time-of-day
alarm, once-per-second to once-per-day
SMI lines
15 IRQ routing options
External modem ring on serial port
Ring pulse or pulse train on RING input signal
Software-controlled off events
(Continued)
4
Clocks
— Single 32.768 KHz crystal oscillator
— LPC clock, up to 33 MHz
— On-chip high frequency clock generator
— 32 KHz clock out
— CR16B clock out
Power Supply
— 3.3V supply operation
— 5V tolerance and back-drive protection on all pins
— Separate supply for Host I/F (V
— Backup battery input for RTC, and wake-up configu-
— Reduced power consumption capability
— Four power modes, switched by software or hard-
— Automatic wake-up on system events
Package Options
— 128-pin LQFP package
— 176-pin LQFP package for more GPIO pins, Expan-
(except LPC bus pins and keyboard scan inputs)
Controller functions (V
ration.
ware
sion Memory use and development systems
CPU clock 4-20 MHz
Software-controlled frequency generation
Multiplier source 32 KHz input
Active mode current (TBD mA)
Active mode executing WAIT
Idle (15 A)
Power off for RTC only (0.9
backup battery
CC
)
DD
) and Embedded
A typical) from
Revision 1.07