User Guide

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1.2.5 Super I/O_NS PC87393

National Semiconductor’s PC8739x family of LPC Super I/O devices is targeted for a wide range of portable

applications. PC99 and ACPI compliant, the PC8739x family features an X-Bus Extension for read and write

operations over the X-Bus, a full IEEE 1284 Parallel Port with a Parallel Port Multiplexer (PPM) for external Floppy

Disk Drive (FDD) support, a Musical Instrument Digital Interface (MIDI) port, and a Game port. Like all National

LPC Super I/O devices, the PC8739x offers a single-chip solution to the most commonly used PC I/O peripherals.

The PC8739x family also incorporates: a Floppy Disk Controller (FDC), two enhanced Serial Ports (UARTs), one

with Fast Infrared (FIR, IrDA 1.1 compliant), General-Purpose Input/Output (GPIO) support for a total of 32 ports,

Interrupt Serializer for Parallel IRQs and an enhanced WATCH DOG timer.

1.2.6 Keyboard controller Hitachi H8/3437

The H8/3437 Series is a series of high-performance micro-controllers with a fast H8/300 CPU core and a set of on-

chip supporting functions optimized for embedded control. These include ROM, RAM, four types of timers, a serial

communication interface, optional I2C bus interface, host interface, A/D converter, D/A converter, I/O ports, and

other functions needed in control system configurations, so that compact, high-performance systems can be

implemented easily. The series includes the H8/3437 with 60kbyte ROM and 2kbyte RAM, the H8/3436 with 48kbyte

ROM and 2kbyte RAM, and the H8/3434 with 32kbyte ROM and 1kbyte RAM.

The H8/3437, H8/3436, and H8/3434 are available in mask-ROM versions. The H8/3437 and H8/3434 are also

available in ZTAT™*1 (zero turn-around time) versions, providing a quick and flexible response to conditions from

ramp-up through full-scale volume production, even for applications with frequently-changing specifications. In

addition, the H8/3434 and H8/3437 have F-ZTAT™*2 (flexible-ZTAT) versions with on-board programmability.