20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 153
20-668-0003
Manufacturer Part Number
20-668-0003
Description
IC CPU RABBIT2000 30MHZ 100PQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0003.pdf
(228 pages)
Specifications of 20-668-0003
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
Data Bus Width
8 bit
Maximum Clock Frequency
30 MHz
Operating Supply Voltage
0 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
40
Number Of Timers
8 & 10 bit
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
20-668-0003
316-1062
316-1062
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
20-668-0003
Manufacturer:
Rabbit Semiconductor
Quantity:
10 000
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As a simple example, suppose that the slave is to be used as a four-port UART. It has the
capability to send or receive characters on any of its four serial ports. Leaving aside the
question of setup for parameters, such as the baud rate, we could define a protocol as fol-
lows.
The slave can interrupt the master at any time by storing to SPD0R. It will do this every
time an enabled transmitter is ready to accept a character or every time an enabled receiver
receives a character. When it stores to SPD0R, it will store a code indicating the reason for
the interrupt, that is, receive or transmit and channel number. If the cause is receive, the
received character will also be placed in SPD1R writable by the slave. When the master is
interrupted for any reason, the master will sneak a peek at SPD0R by reading SPSR. If the
interrupt is caused by a receive character, it will remove the character from SPD1R and
read SPD0R to handshake with the slave.
If the master is interrupted for transmitter ready, as determined by the sneak peek, it will
place the outgoing character in SPD1R and write a code to SPD0R indicating transmit and
channel number. This will cause the slave to be interrupted, and the slave will take the
character and handshake by reading SPD0R. This handshake does not interrupt the master.
Chapter 13 Rabbit Slave Port
SPD0R readable by master is a status register with bits indicating which of the four
receivers and four transmitters is ready, that is, has a character received or is ready to
send a character.
SPD0R writable by the master is a control register used to send commands to the slave.
SPD1R is used to send or receive data characters or control bytes.
The line /SLAVEATTN is wired to the external interrupt request of the master so that
the master is interrupted when the slave writes to SPD0R. Typically the slave will
write to SPD0R when there is a change of status on one of the serial ports.
147
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