FUNCTIONAL OVERVIEW
The GL600USB is a 8-bits RISC-like high performance microcontroller with a built -in 1.5Mbps SIE and transceiver. The microcontroller features 33 instructions optimized for USB applications. There are 64 bytes on-chip RAM and  1.75Kx 14 program ROM incorporated into the microcontroller.The GL600USB accepts a 6MHz ceramic resonator or a crystal as its clock source.

FEATURES
·  Low -cost solution forlow -speed USB mouse
·  8-bit micro -controller
-  Operation Speed: DC to 6MHzclock input
-  Performance: 3 MIPS @ 6MHz
-  Single cycle instruction execution
-  RISC-like architecture
-  USB optimized instruction set
·  USB Specification Compliance
-  Conforms to USB 1.5Mbps Specification, Version 1.1
-  Conforms to USB HID Class Specification, Version 1.1
-  Supports 1 device address and 2 endpoints  (include endpoint 0)
·  I/O ports
-  Up to 13(GL600USB)/11(GL600USB-A)/9(GL600USB-B) general purpose I/O pins  (OTP type is less a GPIO pin thanmask type)
-  Internal RC clock to wakeup periodically (about 500ms) when suspend
-  Up to 8(GL600USB)/6(GL600USB-A)/4(GL600USB-B) special purpose I/O pins optimized for photo-sensor (Internal build in 4 bits ADC)
-  Up to 2 I/O pins with large current drive capability to drive LED (Sink current up to 16 mA)
·  Internal memory
-  64 bytes of RAM (special purpose register is not included)
-  1.75K x 14 of program ROM
·  Integrated USB transceiver
·  Patentedfull-range detection for photo-sensor
-  Removes the expensive process of ma tching LED and photo-sensor
·  On-chip 3.3v output
-  No external regulator required
·  Improved output drivers with slew -rate control to reduce EMI
·  6 MHz external clock
·  Internal power -on reset(POR)
·  Internal power -fail detector
·  Supports suspend/normal mode power ma nagement
-  Suspend current lower than 400mA for whole mouse system (mask type)
·  8-bits free-running timer
·  Available in cost saving 20-pin(GL600USB) PDIP, 18-pin(GL600USB-A) PDIP and 16-pin(GL600USB-B) PDIP