20-668-0011 Rabbit Semiconductor, 20-668-0011 Datasheet - Page 149
20-668-0011
Manufacturer Part Number
20-668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
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
Available stocks
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Manufacturer
Quantity
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Part Number:
20-668-0011
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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18. S
P
E – F
ERIAL
ORTS
18.1 Overview
Serial Ports E and F are identical to each other, and their asynchronous operation is identi-
cal to that of Serial Ports A – D except for the source of the data clock, the buffer sizes,
and the transmit, receive, and clock pins. Each serial port can be used in the asynchronous
or the HDLC mode with an internal or external clock.
In the asynchronous mode, either 7 or 8 data bits can be transferred, and both a parity bit
and/or an additional address (0) or long stop (1) bit can be appended as well. Parity and the
address/long stop bits are also detected when they are received. The asynchronous mode is
full-duplex.
The transmit and receive buffers of Serial Ports E and F have 4 bytes each; this reduces the
interrupt overhead requirements. A serial port interrupt is generated whenever at least one
byte is available in the receive buffer or whenever a byte is shifted out of the transmit buf-
fer. The byte is available in the buffer after the final bit is sampled.
The status of each serial port is available in the Serial Port Status Registers (SxSR), and
contains information on whether a received byte is available, the receive buffer was over-
run, a parity error was received, and the transmit buffer is empty or busy sending a byte.
The status is updated when the final bit of a received byte is sampled, or when the final bit
of a transmitted byte is sent out.
Serial Ports E and F support the HDLC mode with either an internal or an external clock;
separate pins may be used for the transmit and receive clocks, or the transmit and receive
clocks may be combined onto a single pin. The HDLC packet flag encapsulation, flag
escapes, and CRC calculation and check are handled automatically by the processor. The
serial port can detect end-of-frame, short-frame, and CRC errors. Interrupts are generated
by the reception of an end-of-frame, at the end of a transmission of a CRC, by an abort
sequence, or by a closing flag. Transmit and receive operations are essentially automatic.
16
12
5
The standard CRC-CCITT polynomial (x
+ x
+ x
+ 1) is implemented for the CRC,
with the generator and checker preset to all ones.
It is possible to send packets with or without a CRC appended. It is also possible to select
whether an abort or flag will be transmitted if the transmitter underflows. A packet under
transition can be aborted and the abort pattern sent. The idle condition of the line can be
flags or all ones.
Chapter 18 Serial Ports E – F
139
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