20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 83

• Manufacturer Part Number: 20-668-0024
• Description: IC CPU RABBIT4000 128-LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0024

• Processor Type: Rabbit 4000 8-bit
• Speed: 60MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: 20-668-0022; 316-1078

8.1 Overview
Parallel Port A is a byte-wide port that can be used as an input or an output port. Parallel
Port A is also used as the data bus for the slave port and auxiliary I/O bus. The Slave Port
Control Register (SPCR) is used to configure how Parallel Port A is used. Parallel Port A
is an input at startup or reset. If the SMODE pins have selected the slave port bootstrap
mode, Parallel Port A will be the slave port data bus until disabled by the processor. Parallel
Port A can also be used as an external I/O data bus to isolate external I/O from the main
data bus.
8.1.1 Block Diagram
8.1.2 Registers
Chapter 8 Parallel Port A
Port A Data Register
Register Name
Table 8-1. Parallel Port A Pin Alternate Output Functions
Pin Name
PA[7:0]
Slave Port
Data Bus
SD[7:0]
Mnemonic
8. P
PADR
ARALLEL
Auxiliary I/O
I/O Address
ID[7:0]
Bus
0x0030
R/W
R/W
P
ORT
xxxxxxxx
Reset
A
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