20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 27

• 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

The 32 kHz oscillator can be used to drive the processor and peripheral clock to provide
significant power savings in “ultra-sleepy” modes. The 32 kHz oscillator can be divided
by 2, 4, 8, or 16 to provide clock speeds as low as 2.048 kHz. Special self-timed chip
selects are available to keep the memory devices enabled for as short a time as possible
when an ultra-sleepy mode is enabled; see Chapter 25 for more details on reducing power
consumption.
When the 32 kHz clock is enabled, the periodic interrupt is disabled automatically. The
real-time clock and watchdog timers keep running, and use the full 32 kHz clock even
when the processor and peripheral clocks use a divider on the 32 kHz clock.
Chapter 2 Clocks
Table 2-4. Ultra-Sleepy Clock Modes
xxxxx000
xxxxx100
xxxxx101
xxxxx110
xxxxx111
GPSCR
Setting
Peripheral Clock
Processor and
32.768 kHz
16.384 kHz
8.192 kHz
4.096 kHz
2.048 kHz
17