20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 88

• 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

9.1.1 Block Diagram
9.1.2 Registers
9.2 Dependencies
9.2.1 I/O Pins
Parallel Port B uses pins PB0 through PB7. These pins can be used individually as data
inputs or outputs; as the address bits for the auxiliary I/O bus; as control signals for the
slave port; or as clocks for Serial Ports A and B.
On startup, bits 6 and 7 are outputs set low for backwards compatibility with the Rabbit
2000. All other pins are inputs.
Note that when the auxiliary I/O bus or slave port is enabled in SPCR, the Parallel Port B
pins associated with those peripherals perform those actions, no matter what the settings
are in PBDR or PBDDR. See the associated peripheral chapters for details on how they
use Parallel Port B.
9.2.2 Clocks
All outputs on Parallel Port B are clocked by the peripheral clock (perclk).
9.2.3 Other Registers
78
Port B Data Register
Port B Data Direction Register
SPCR
Register Name
Register
Sets the Parallel Port B function for some pins if the
slave port or auxiliary I/O bus is enabled.
Mnemonic
PBDDR
PBDR
Rabbit 4000 Microprocessor User’s Manual
Function
I/O Address
0x0040
0x0047
R/W
R/W
R/W
00xxxxxx
11000000
Reset