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INTRODUCTION

The ST7HUB is a USB microcontroller based on ST7 core, which is an enhanced industry-standard architecture. The USB module of the ST7HUB is a compound device, consisting of a 3-port HUB and an attached embedded function. To the USB host, the embedded function appears as an attached port of the HUB with its own device address and endpoints.

■ Memories

– 32K High Density Flash (HD-Flash) program memory with read/write protection or 16K ROM

– In-Application Programming (IAP) via USB and In-Circuit programming (ICP) for Flash device

– 768 bytes RAM memory including up to 176 bytes for USB buffers and up to 256 bytes stack

■ Clock, Reset and Supply Management

– Enhanced Reset System (Power On Reset) and Low Voltage Detector (LVD) on some devices

– PLL for generating 48 MHz USB clock using a 4 MHz crystal

– Up to 12 MHz internal frequency on ROM device

– Up to 8 MHz internal frequency on Flash device

– Clock-out capability

– 2 Power saving modes

■ USB HUB Function

– 3 bus-powered downstream ports (1 connected internally to embedded function)

– Individual downstream Power Switching

– Overcurrent Protection for each downstream

– Supports all USB Standard and HUB commands

– Integrated 3.3V voltage regulator and transceivers

■ USB Full Speed Function

– 7 USB Endpoints:

One 8-byte Bidirectional Control Endpoint

One 64-byte In Endpoint (Interrupt or Bulk)

One 64-byte Out Endpoint (Interrupt or Bulk)

Four 8-byte In Endpoints (Interrupt)

– DMA for Full speed applications compliant with USB specification (v 2.0) – Suspend and Resume operations

■ 35 I/O Ports

– 35 multifunctional bidirectional I/O lines

– 23 individually selectable external interrupts (3 vectors) with per port programmable sensitivity

– Pull up resistors in input individually selectable by software

– 3 ports (20 I/Os) can be individually configured to open drain pull up configuration for PS/2 and keyboard function.

– 7 high sink outputs (8 mA@0.4 V/20 mA@1.3 V)

■ 3 Timers

– Configurable watchdog timer (8 to 500 ms timeout)

– 8 bit Time Base Unit (TBU) for generating periodic interrupts, cascadable with ART

– 8 bit Auto-Reload Timer (ART) with 2 Input Captures, 2 PWM outputs and External Clock Input

■ Analog Peripheral

– 10-bit A/D Converter with VREF+ and VREF- reference pins 4 high impedance high accuracy channels 12 standard channels

■ 1 Communication Interface

– Serial Peripheral Interface (SPI)

■ Instruction Set

– 8-bit data manipulation

– 63 basic instructions

– 17 main addressing modes

– Nested Interrupts

– 8 x 8 unsigned multiply instruction

– True bit manipulation

■ Development Tools

– Full hardware/software development package

■ Operating Conditions

– 4.0 to 5.25V power supply

– 0 to 70°C temperature range