20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 132

• 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

In the asynchronous mode, IrDA-compliant RZI encoding can be enabled to reduce the bit
widths to 3/16 the normal width (1/8 the normal width if the serial data clock is 8× instead
of 16×), which allows the serial port signal to be connected directly to an IrDA transceiver.
It is possible to synchronize a clocked serial trans-
fer to the match registers of Timer B to generate
precisely timed transmissions.
The serial port data clocks can be generated from
the appropriate 8-bit timer from Timer A shown in
Table 17-1. The resulting bit data rate in the asyn-
chronous mode is 1/8 or 1/16 the data clock rate
(selectable). However,the bit data rate in the
clocked serial mode is equal to the data clock rate
as generated from the appropriate Timer A timer.
When Serial Port A is used in the asynchronous bootstrap mode, the 32 kHz clock is used
to generate the expected 2400 bps data rate. An external clock must be supplied for the
clocked serial bootstrap mode.
The behavior of the serial port during a break (line held low) is configurable; character
assembly can continue during the break condition to allow for timing the break, or charac-
ter assembly can be inhibited to reduce the interrupt overhead.
122
Figure 17-1. Serial Ports A – D Operation in Clocked Serial Mode
Rabbit 3000 Microprocessor User’s Manual
Table 17-1. Timer A Data Clocks
Serial Port
A
B
C
D
Data Clock
Timer A4
Timer A5
Timer A6
Timer A7