EM78611 Datasheet, PDF (1/26 Pages) ELAN Microelectronics Corp – Universal Serial Bus Microcontroller Series

EM78611
Universal Serial Bus Microcontroller Series
Preliminary
SPECIFICATION
1. General Description
The EM78611 is a series of Universal Serial Bus 8-bit RISC microcontrollers. It is specifically
designed for USB low speed device application and to support legacy device such as PS/2
keyboard. The EM78611 also support one device address and three endpoints. With no
firmware involved, these series of microcontrollers can automatically identify and decode
Standard USB Command to EndPoint Zero.
The EM78611 is implemented on a RISC architecture. It has eight-level stack and six
interrupt sources. Each device has 144 bytes of general purpose SRAM and 6K bytes of
program ROM. The EM78611 has up to 13 pins with the capacity of sinking large current. It
also has dual clock mode which allows the device to run on very low power saving frequency
2. Features
Operating voltage 4.4V ~ 5.25V
Low-cost solution for low-speed USB devices, such as keyboard, joystick, and
Gamepad.
USB Specification Compliance
Universal Serial Bus Specification Version 1.1
USB Device Class Definition for Human Interface Device (HID), Firmware
Specification Version 1.1
Support 1 device address and 3 endpoints
USB Application
P75(D-) has an internal pull-high resistor (1.5K Ohm)
USB protocol handling
USB device state handling
Identifying and decoding of Standard USB commands to EndPoint Zero
PS/2 Application Support
Auto-detects PS/2 or USB port
Build-in PS/2 port interface for keyboard and mouse
Built-in 8-bit RISC MCU
8 level stacks for subroutine and interruption
Six available interruptions
8-bit real time clock/counter (TCC) with overflow interruption
This spec. may change without further notice.
1
06/10/2003 (V1.0)