FT905 datasheet(23/56 Pages) FTDI

23 / 56 page

FT905

_6_7_8/6/7/8 Embedded Microcontroller Datasheet

Version 1.0

Document No.: FT_001131 Clearance No.: FTDI#422

4 Function Description

4.1 Architectural Overview

The FT905 series embedded microcontrollers includes a high performance 32-bit FT32 RISC

core processor and 256kB hi-speed Flash memory for software program download with One-

Wire debugger interface. The core processor uses a 32-bit I/O system bus to connect to all of

the peripherals.



USB2.0 host controller



USB2.0 peripheral controller



10/100Mbps Ethernet controller (FT905 and FT906 only)



Two CAN bus interfaces (FT905 and FT907 only)



Real Time Clock



One-Wire debugger interface



One SPI master interface and one SPI slave interface



One I2C bus interfaces



UART interface



Four timers and a 32-bit watchdog timer



PWM motor controller



10-bit DAC0/1 channel



10-bit ADC1-4 channel



General purpose I/O interface

The functions for each controller / interface are briefly described in the following subsections.

4.2 FT32 Core Processor

The FT32 core processor is running at frequencies of up to 100MHz.The processor contains the

CPU itself with control logic and its 256kB program memory and 64kB data memory. The

outside connections for the core processor are the memory-mapped I/O interface, the interrupt

interface, asynchronous reset and the system clock.

4.3 256kB Flash Memory

The internal 256kB Flash memory is used to store a boot loader or user application of the

FT905 series. It is a high performance and low power consumption memory that supports upto

80MHz serial clock. The system will perform memory copy from Flash memory to CPU program

memory automatically after system power on.

4.4 Boot Sequence

After the initial memory copy completes, the CPU jumps to program memory location zero.

This may be the start of the user application which is stored in advance in Flash memory, or a

boot loader only which allows program memory to perform modification via (e.g.) UART or

USB.

The option of a boot loader is a special purpose routine in the FT905 series embedded

microcontroller. It is small routine stored in the Flash memory. Typically the boot loader is 1-

4kbytes in size, and is loaded at the top of the available memory.

4.5 Interrupt

The FT905 series interrupt controller handles 32 interrupt inputs. When an interrupt occurs,

the Interrupt Service Route (ISR) will process this event via the CPU. The ISR vector range is

from 0 to 31, which corresponds to interrupts 0 to 31. See Table 4-1 information.

FT905 Datasheet(PDF) 23 Page - Future Technology Devices International Ltd.

FT905 Datasheet(HTML) 23 Page - Future Technology Devices International Ltd.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Datasheet Download

Link URL