668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 171
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
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
Features
-
Other names
316-1016
- Current page: 171 of 312
- Download datasheet (2Mb)
These connections are summarized in Table 19-3.
Note that the slave port on the master Rabbit processor is not used; the master uses the
data bus to send and receive data to the slave port data registers on the slave devices.
In this setup, pins PE6 and PE7 are set up as I/O strobe chip selects for the two slave devices,
and PE0 and PE1 are used as external interrupt inputs to monitor the /SLAVEATTN signals
from the slaves.
In this setup, the slave port is used as follows:
• The slave responds to the interrupt and reads the slave port data registers.
• When the slave wishes to send data to the master, it writes the slave port data registers,
• When the master detects the change on /SLAVEATTN, it reads the slave port data
19.3.1 Master Setup
1. Enable the I/O strobes on PE6 and PE7 by writing to the appropriate Parallel Port E pin
2. Enable the external interrupts on PE0 and PE1 by writing to the appropriate external
19.3.2 Slave Setup
1. Write the vector to the interrupt service routine to the internal interrupt table.
2. Configure SPCR to select the interrupt priority (note that interrupts will be enabled
Chapter 19 Slave Port
writing SPD0R last, which enables the /SLAVEATTN signal.
registers.
and external I/O registers.
interrupt registers.
once this value is set).
Data Bus
Address Bus
I/O Read Strobe
I/O Write Strobe
Slave #1 Chip Select
(I/O strobe I7)
Slave #2 Chip Select
(I/O strobe I6)
External Interrupt 0
(from Slave #1)
External Interrupt 1
(from Slave #2)
Master
Table 19-3. Typical Slave Port Connections
D0–D7
A0–A1
/IOWR
/IORD
PE7
PE6
PE0
PE1
/SLAVEATTN
SD0–SD7
SA0–SA1
/SWR
/SRD
/SCS
—
—
Slave #1
PB4–PB5
PA0–PA7
PB3
PB2
PB6
PB7
—
—
/SLAVEATTN
SD0–SD7
SA0–SA1
/SWR
/SRD
/SCS
—
–
Slave #2
PB4–PB5
PA0–PA7
PB3
PB2
PB6
PB7
—
—
161
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