20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 292

• 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.1.12.2 Short Chip Select Timing
When short chip selects are enabled for read cycles, the chip select signals are active only
for the last part of the bus cycle. Wait states are inserted between T1 and T2, so this will
have no effect on the duration of the chip select signals in this mode. The timing diagrams
below illustrate the actual timing for the different divided cases. In these cases the chip
selects are two clock cycles (of the fast oscillator) long.
282
Figure B-3. Short Chip Select Timing: perclk/8, Read Operation
Figure B-4. Short Chip Select Timing: perclk/6, Read Operation
Rabbit 3000 Microprocessor User’s Manual