UNIVERSAL SERIAL BUS PERIPHERAL CONTROLLERS

The 8x931AA and 8x931HA USB peripheral controllers are based on the MCS®51 microcontroller. They consist of standard 8XC51Fx peripherals plus a USB module. The 8x931HA USB module provides both USB hub and USB embedded function capabilities. The 8x931HA supports USB hub functionality, embedded function, suspend/resume modes, isochronous/non-isochronous transfers, and is USB rev 1.0 specification compliant. The USB module contains one internal and 4 external downstream ports and integrates the USB transceivers, serial bus interface engine (SIE), hub interface unit (HIU), function interface unit (FIU), and transmit/receive FIFOs. The 8x931AA is a hubless USB peripheral controller which contains the same feature set as the 8x931HA hub controller except for the hub module. The 8x931AA/HA uses the standard instruction set of the MCS 51 architecture.

■ 8x931AA Hubless USB Peripheral Controller
■ On-chip USB Transceivers
■ On-chip Phase-locked loop
■ FIFO Data Buffers
   — Two Pairs of 8-byte Transmit and Receive FIFOs
   — One Pair of 16-byte Transmit and Receive FIFOs
   — Supports Isochronous and Non-isochronous Data
■ Automatic FIFO Management
■ Three USB Interrupt Vectors
   — Endpoint Transmit/Receive Done
   — Start of Frame
   — Global Suspend/Resume/USB Reset
■ Regulated 3V Output for Root Port Pullup Resistor
■ On-chip ROM Options
   — 0 or 8 Kbytes
■ 256 bytes On-chip Data RAM
■ Four Input/Output Ports
■ MCS® 51 UART
■ Three 16-bit Timer/Counters
■ Keyboard Control Interface
■ Four Dedicated LED Driver Outputs
■ 6- or 12-MHz Crystal Operation
   — Low Clock Mode (3MHz)
■ 8x931HA Includes all 8x931AA Features
■ 8x931HA USB Hub has One Internal Downstream, and Four External Downstream Ports
   — Universal Serial Bus Specification 1.0 Compliant
   — Serves as both USB Hub and USB Embedded Function (Internal Port)
■ USB Hub
   — Connectivity Management
   — Downstream Device Connect/Disconnect Detection
   — Power Management, Including Suspend and Resume
   — Bus Fault Detection and Recovery
   — Full and Low Speed Downstream Device Support
■ Hub Endpoint Done Interrupt
■ Output Pin for Port Power Switching
■ Input Pin for Overcurrent Detection
■ Hub FIFO Data Buffers
   — One Pair of 8-byte Transmit and Receive FIFOs
   — One 1-byte Transmit Register
■ Embedded Function FIFO Data Buffers
   — Same as the 8x931AA
■ 12-MHz Crystal Operation
   — Low Clock Mode (3MHz)