668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 81

• Manufacturer Part Number: 668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

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

9.2.4 Interrupts
There are no interrupts associated with Parallel Port B.
9.3 Operation
The following steps must be taken before using Parallel Port B.
1. Select the desired input/output direction for each pin via PBDDR. Note that this setting
2. If the slave port or the external I/O bus is selected, refer to the chapters for those
Once the port is set up, data can be read or written by accessing PBDR. The value in
PBDR of an output pin will reflect its current output value, but any value written to an
input pin will not appear until that pin becomes an output.
9.4 Register Descriptions
Chapter 9 Parallel Port B
Bit(s)
Bit(s)
is superseded for some pins if the slave port or external I/O bus is enabled in SPCR or if
the clocked serial mode is enabled for Serial Ports A or B.
peripherals for further setup information.
Parallel Port B Data Direction Register
7:0
7:0
Parallel Port B Data Register
Value
Value
Write
Read
0
1
The current state of Parallel Port B pins PB7–PB0 is reported.
The Parallel Port B buffer is written with this value for transfer to the Parallel
Port B output register on the next rising edge of the peripheral clock.
The corresponding port bit is input.
The corresponding port bit is an output.
(PBDDR)
(PBDR)
Description
Description
(Address = 0x0040)
(Address = 0x0047)
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