20-668-0024 Rabbit Semiconductor, 20-668-0024 Datasheet - Page 158

• 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

17.2 Dependencies
17.2.1 I/O Pins
Serial Port E can transmit on parallel port pins PC6, PD6, or PE6, and can receive on pins
PC7, PD7, or PE7. If the HDLC mode is enabled, the transmit serial clock is either trans-
mitted or received on PC4, PD4, or PE4, while the receive serial clock is either transmitted
or received on PC5, PD5, or PE5.
Serial Port F can transmit on parallel port pins PC2, PD2, or PE2, and can receive on pins
PC3, PD3, or PE3. If the HDLC mode is enabled, the transmit serial clock is either trans-
mitted or received on PC0, PD0, or PE0, while the receive serial clock is either transmitted
or received on PC1, PD1, or PE1.
17.2.2 Clocks
The data clocks for Serial Ports E – F are based on the peripheral clock and divided by
either a Timer A divider or a dedicated 15-bit divider. In either case, the overall clock
divider will be the value in the appropriate register plus one.
17.2.3 Other Registers
148
TAT2R
TAT3R
PCFR, PCAHR, PCALR
PDFR, PDAHR, PDALR
PEFR, PEAHR, PEALR
Transmit Clock
Receive Clock
Function
Register
Transmit
Receive
Table 17-1. Serial Ports E and F Pin Usage
Time constant for Serial Port E
Time constant for Serial Port F
Alternate port output selection
PC6, PD6, PE6
PC7, PD7, PE7
PC4, PD4, PE4
PC5, PD5, PE5
Serial Port E
Rabbit 4000 Microprocessor User’s Manual
Function
PC2, PD2, PE2
PC3, PD3, PE3
PC0, PD0, PE0
PC1, PD1, PE1
Serial Port F