FT245R Future Technology Devices Intl Ltd., FT245R Datasheet - Page 22

• Manufacturer Part Number: FT245R
• Manufacturer: Future Technology Devices Intl Ltd.

8. Example Interface Configurations
Figure 15 -Example USB to MCU FIFO Interface
Figure 15 illustrates a typical interfacing between the FT245R and a Microcontroller (MCU) FIFO interface. This
example uses two I/O ports: one port (8 bits) to transfer data, and the other port (4 or 5 bits) to monitor the TXE# and
RXF# status bits and generate the RD# and WR strobes to the FT245R, as required. Using PWREN# for this function
is optional.
If the Remote Wakeup option is enabled in the internal EEPROM, during USB suspend mode RXF# becomes an input
which can be used to wake up the USB host controller by strobing the pin low.
FT245R USB UART I.C. Datasheet Version 1.02
8.1 USB to MCU FIFO Interface Example
5
Vcc
100nF
4.7uF
GND
1
2
3
4
+
GND
+
10nF
Ferrite
Bead
GND
100nF
Vcc
VCC
USBDM
USBDP
VCCIO
NC
RESET#
NC
OSCI
OSCO
3V3OUT
A
G
N
D
FT245R
G
N
D
G
N
D
GND
G
N
D
© Future Technology Devices International Ltd. 2005
T
E
S
T
PWREN#
RXF#
TXE#
WR#
RD#
D0
D1
D2
D3
D4
D5
D6
D7
I/O10
I/O11
I/O17
I/O12
I/O13
I/O14
I/O15
I/O16
I/O20
I/O21
I/O22
I/O23
I/O24
Vcc