20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 303

• Manufacturer Part Number: 20-668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0011

• Processor Type: Rabbit 3000 8-Bit
• Speed: 55.5MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 55.5 MHz
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 55 C
• Number Of Programmable I/os: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 316-1061

B.1.14 Quadrature Decoder Improvements
The Quadrature Decoder counters can now be expanded to 10 bits instead of 8 bits. This is
controlled by bit 5 in QDCR. The additional two bits can be read in the QDCxHR registers.
Reading the lower 8 bits of the Quadrature Decoder latches the upper 2 bits, which can then
be read at any time afterwards. The latch is cleared when the upper 2 bits are read, and
subsequent reads of these upper two bits will return the current counter value until they are
latched again by another read of the lower 8 bits.
Figure B-22. Quadrature Decode, 8-bit and 10-bit Counter Timing
Appendix B Rabbit 3000 Revisions
293