FT51A Advanced MCU with 8051 Compatible Core IC Datasheet
Version 1.5
Document No.: FT_000877
Clearance No.: FTDI#420
3 Functional Description
Figure 3-1 – FT51A Block Diagram
The FT51A acts as a USB hub supporting two downstream ports; the internal 8051 core and other
peripherals (SPI, UART, etc.) and an external downstream port (typical devices can be a mouse,
keyboard, mass storage device, etc.). The hub can optionally be disabled (under register control)
resulting in the 8051 core appearing at the upstream port.
3.1 Key Features
3.1.1
Functional Integration
Fully integrated MTP memory with built in shadow RAM for fast memory access, internally generated
clock, Power-On-Reset (POR) and LDO regulators.
3.1.2
8051 Core
The FT51A is based aroundthe industry standard 8051 microcontroller capable of running at a maximum
frequency of 48MHz. The core is an ultra-high performance, speedoptimized single-chip 8-bit embedded
controller dedicated for operation with fast on-chip memories.
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