668-0003-C Rabbit Semiconductor, 668-0003-C Datasheet - Page 109

• Manufacturer Part Number: 668-0003-C
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0003-C

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Features: -
• Other names: 316-1004; 668-0003

9.4 Parallel Port D
Parallel port D, shown in Figure 9-1, has eight pins that can programmed individually to be
inputs and outputs. When programmed as outputs, the pins can be individually selected to be
open-drain outputs or standard outputs. Port D pins can be addressed by bit if desired. The
output registers are cascaded and timer-controlled, making it possible to generate precise
timing pulses. In addition, port D outputs have a higher drive capability. Port D bits 4 and 5
can be used as alternate bits for serial port B, and bits 6 and 7 can be used as alternate bits
for serial port A. Alternate serial port bit assignments make it possible for the same serial
port to connect to different communications lines that are not operating at the same time.
On reset, the data direction register is zeroed, making all pins inputs. In addition bits in the
control register are zeroed (bits 0,1,4,5) to ensure that data is clocked into the output regis-
ters when loaded. All other registers associated with port D are not initialized on reset.
The following registers are described in Table 9-8 and in Table 9-9.
• PDDDR—Parallel port D data direction register. A "1" makes the corresponding pin an
• PDDCR—Parallel port D drive control register. A "1" makes the corresponding pin an
• PDFR—Parallel port D function control register. This port may be used to make port
Chapter 9 Parallel Ports
Port D Data Register
Port D Drive Control Register
Port D Data Direction Register
Port D Function Register
Port D Control Register
Port D Bit 0 Register
Port D Bit 1 Register
Port D Bit 2 Register
Port D Bit 3 Register
Port D Bit 4 Register
Port D Bit 5 Register
Port D Bit 6 Register
Port D Bit 7 Register
output. Write only.
open-drain output if that pin is set up for output. Write only.
positions 4 and 6 be serial port outputs. Write only.
Register Name
Table 9-7. Parallel Port D Registers
PDDR
PDDCR
PDDDR
PDFR
PDCR
PDB0R
PDB1R
PDB2R
PDB3R
PDB4R
PDB5R
PDB6R
PDB7R
Mnemonic
0x60
0x66
0x67
0x65
0x64
0x68
0x69
0x6A
0x6B
0x6C
0x6D
0x6E
0x6F
I/O address
R/W
W
W
W
W
W
W
W
W
W
W
W
W
R/W
xxxxxxxx
xxxxxxxx
00000000
xxxxxxxx
xx00xx00
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
Reset
103