EM78M612
Universal Serial Bus Microcontroller Series
SPECIFICATION
1 General Description
The EM78M612 is a series of Universal Serial Bus 8-bit RISC Multi-Time Programming
(MTP) microcontrollers. It is specifically designed for USB low speed device application and
to support legacy device such as PS/2 mouse. The EM78M612 also support one device
address and two endpoints. With no firmware involved, these series of microcontrollers can
automatically identify and decode Standard USB Command to EndPoint Zero.
The EM78M612 is implemented on a RISC architecture. It has five-level stack and eight
interrupt sources. The amount of General Input/Output pins is up to 15. Each device has 112
bytes SRAM and is embedded with 4 bytes of E2PROM. The ROM size of the EM78M612 is
2K.
These series of chips have special features that accommodate your needs. These features
are:
ꢀ Dual Clock mode which allows the device to run on very low power saving frequency
ꢀ Pattern Detecting Application function which is used in a serial transmission to count
waveform width
ꢀ Width Modulation that can generate a duty-cycle-programmable signal
ꢀ AD converter with up to 10 bits resolution.
2 Features
ꢀ Low-cost solution for low-speed USB devices, such as mouse, 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 2 endpoints
ꢀ USB Application
ꢁ
ꢁ
ꢁ
USB protocol handling
USB device state handling
Identifies and decodes Standard USB commands to EndPoint Zero
ꢀ PS/2 Application Support
ꢁ
Auto-detects PS/2 or USB port
Built-in PS/2 port interface
ꢁ
This specification may change without further notice.
2004/4/28 V1.1
2
ELAN [ ELAN MICROELECTRONICS CORP ]
