668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 113

• 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

14.2.3 Interrupts
There are no interrupts associated with Parallel Port G.
14.3 Operation
The following steps must be taken before using Parallel Port G.
1. Select the desired input/output direction for each pin via PGDDR.
2. Use PGCR to select the clock.
3. If an alternative function is desired for a pin, select it via PGFR.
Once the port is set up, data can be read or written by accessing PGDR. The value of an
output pin read in from PGDR will reflect its current output value, but any value written to
an input pin will not appear until that pin becomes an output.
On reset, PGDDR is zeroed, making all pins inputs, and disabling the alternate output
functions. In addition, bits 0, 1, 4, and 5 in PGCR are zeroed to ensure that data are
clocked into the output registers when loaded. All other registers associated with Parallel
Port G are not initialized on reset.
Chapter 14 Parallel Port G
103