DLP-2232PB DLP Design Inc, DLP-2232PB Datasheet - Page 6

• Manufacturer Part Number: DLP-2232PB
• Description: Interface Modules & Development Tools 50P-DIP USB-FIFO Module
• Manufacturer: DLP Design Inc

Specifications of DLP-2232PB

• Interface Type: USB
• Data Bus Width: 8 bit
• Operating Supply Voltage: 5 V
• Product: Interface Modules
• For Use With/related Products: 16F877A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

At this point, the DLP-2232PB is ready for use.
If you wish to change drivers from the VCP to the DLL type (or vice versa), you must run the
MPROG utility and change the setup information store in the EEPROM. The utility can be
downloaded from either www.dlpdesign.com or www.ftdichip.com. The DLP-2232PB is shipped
with default VID, PID, etc. values programmed into the EEPROM. You only need to run the
MPROG utility if you want to change the default values.
TOKEN I/O
The 16F877A microcontroller on the DLP-2232PB is shipped from the factory preprogrammed
with firmware that provides rudimentary access to the port pins via either the VCP or DLL drivers.
Features include the ability to read and write individual port pins as well as 8-bit port reads and
writes.
The firmware in the DLP-2232PB also provides access to the 16F877A’s A/D converter,
EEPROM memory, and communications with digital temperature sensing devices.
Commands sent to the Token I/O firmware must adhere to a specific communications protocol.
Each command sequence contains the following information:
The checksum is computed by exclusive-OR-ing every byte in the string. If the same checksum
is calculated by the 16F877A upon receipt of the packet, then a single-byte reply of 0x55 is
returned to the host. In the event of a checksum error, the 16F877A will return an error code of
0xAA. For example, setting port PIN_A1 high would require the following string of bytes:
0x03, 0xA6, 0x29, 0x01, 0x8D
V1.1
host PC will immediately load the correct drivers without any prompting. Reboot the PC if
prompted to do so.
Byte 0:
Byte 1:
Byte 2…n-1:
Byte n:
Number of bytes in command sequence
Command
Parameter/Data bytes
Checksum
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July 2004