The EM78M611E is an integrated USB MTP controller IC. It has a built-in USB transceiver, built-in 4-bit EEPROM, built-in PWM function and built-in AD converter. The EM78M611E can be a USB & PS/2 Keyboard & Mouse controller.

Features

• Fully compliant with the Universal Serial Bus Specification, version 1.1
• USB keyboard design is compliant with USB Device Class Definition for Human
  Interface Device (HID), Firmware Specification, and version 1.1
• Two 8-bit transmit FIFOs
• One 8-bit bidirectional FIFO
• 6K x 13 on-chip Program ROM
• 144 bytes of General Purpose RAM
• 11 LED direct sink pins with internal serial resistor (P70-P72, P76-P77, P90-P93,
  P95-P96)
• Built-in 4-bit EEPROM with a minimum of 10K write/erase cycles (achieved by
  F/W)
• Built-in PWM (Pulse Width Modulation) function
• Built-in 24 channels Analog-to-Digital converter with 10-bit resolution
• 8-level stack for subroutine nesting
• RC Oscillator with internal RC
• Ports 5, 6, 8, 9, P74~P77 with pull-up resistors
• Wake-up pins in Ports 6, 9, P74~P77
• Operates at 6MHz or 12MHz frequency
  * 6MHz Frequency: 2.5V~5.5V
  * 12MHz Frequency: 4.0V~5.5V only
• Available in 40-pin DIP, 44-pin QFP, 20-pin PDIP/SOP/SSOP, 24-pin PDIP/SOP
• Built-in 20MHz Low Pass Filter in Oscillator (maximum MCU frequency is 12MHz)

• USB Keyboard only
• Keyboard switch with USB or PS/2
• USB keyboard with PS/2 mouse port
• USB joystick