668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 79
668-0011
Manufacturer Part Number
668-0011
Description
IC MPU RABIT3000A 55.5MHZ128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0011
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
316-1043
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Part Number:
668-0011
Manufacturer:
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9.1 Overview
Parallel Port B is a byte-wide port with each bit programmable for direction. The Parallel
Port B pins are also used to access other peripherals on the chip—the slave port, the exter-
nal I/O address bus, and clock I/O for clocked serial mode option for Serial Ports A and B.
The Slave Port Control Register (SPCR) is used to configure how Parallel Port B is used
when selecting the slave port or the external I/O bus modes.
When the slave port is enabled, either under program control or during parallel bootstrap,
Parallel Port B pins carry the Slave Attention output signal, and four of the inputs carry the
Slave Read strobe, Slave Write strobe, and Slave Address bits. The Slave Chip Select can
also be programmed to come from a Parallel Port B pin.
When the external I/O bus option is enabled, six pins carry the external I/O address signals
selected in SPCR.
Two pins are used for the clocks for Serial Ports A and B when they are configured for the
clocked serial mode. These two inputs can be used as clock outputs for these ports if
selected in the respective serial port control registers. Note that the clocked serial output
clock selection overrides all other programming for the two relevant Parallel Port B pins.
Chapter 9 Parallel Port B
Table 9-1. Parallel Port B Pin Alternate Output Functions
Pin Name
* Introduced with Rabbit 3000A chip
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
/SLAVEATTN
Slave Port
/ASCS
/SWR
/SRD
SA1
SA0
—
—
*
9. P
Serial Ports
CLKA
CLKB
A–D
—
—
—
—
—
—
ARALLEL
External I/O
Bus
IA5
IA4
IA3
IA2
IA1
IA0
—
—
P
ORT
B
69
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