668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 128
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668-0003-C
Manufacturer Part Number
668-0003-C
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 668-0003-C
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 2000 8-Bit
Speed
30MHz
Voltage
2.7V, 3V, 3.3V, 5V
Mounting Type
Surface Mount
Package / Case
100-MQFP, 100-PQFP
Features
-
Other names
316-1004
668-0003
668-0003
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Part Number:
668-0003-C
Manufacturer:
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Table 12-3 describes the serial port control registers.
122
00—no op
01—receive 1 byte
clocked mode (A,B)
10—send one byte
clocked mode (A,B)
11—reserved for future
use
Bits 7,6—In asynchronous mode, always store zero in these bits. For Ports A and B, if the
Bits 5,4—This enables the standard or alternate pins for the ports. The parallel port output
Bits 3,2—This sets the mode of operation. Modes 10 and 11 apply only to Ports A and B.
Bits 1,0—These bits enable interrupts and set the interrupt priority.
Table 12-3. Serial Port Control Registers (adr = 11xx0100, xx = A,B,C,D)
clocked serial mode is enabled, store the code here to start an operation, either receive or
send. If the clock is internal, a burst of 8 clocks will drive the clock line. In external mode,
the receiver or transmitter waits for an externally supplied burst of 8 clocks.
function for the specified Tx pin becomes disabled when the port is enabled. The settings
in the parallel port C function register (PCFR) and the parallel port D function register
(PDFR) are used to enable the Port C and Port D serial outputs (see Section 9.3, “Parallel
Port C” and Section 9.4, “Parallel Port D” for more details).
Bit 7,6
00—use port C for serial
input
01—use port D for serial
input
1x—disable receiver
input
Bit 5,4
00—async mode, 8 bits
01—async mode 7 bits
10—clocked mode
external clock (A,B)
11—clocked mode
internal clock (A,B)
Rabbit 2000 Microprocessor User’s Manual
Bit 3,2
00—no interrupt
01— priority 1 interrupt
10—priority 2
11—priority 3
Bit 1,0
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