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Rabbit 6000 User’s Manual
digi.com
203
20.2 Dependencies
20.2.1 I/O Pins
Serial Port E can transmit on parallel port pins PC6, PD6, PE6, or PH6, and can receive on pins
PC7, PD7, or PE7. If the HDLC mode is enabled, the transmit serial clock is either transmitted or
received on PC4, PD4, or PE4, while the receive serial clock is either transmitted or received on
PC5, PD5, or PE5. The transmit and receive clocks can also be transmitted on PH4 or PH0 if
internal clock generation is enabled.
Serial Port F can transmit on parallel port pins PC2, PD2, PE2, or PH2, and can receive on pins
PC3, PD3, or PE3. If the HDLC mode is enabled, the transmit serial clock is either transmitted or
received on PC0, PD0, or PE0, while the receive serial clock is either transmitted or received on
PC1, PD1, or PE1. The transmit and receive clocks can also be transmitted on PH5 or PH1 if
internal clock generation is enabled.
20.2.2 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 SxDLR and SxDHR. In either case, the overall
clock divider will be the value in the appropriate register plus one.
20.2.3 Other Registers
Table 20-1. Serial Ports E and F Pin Usage
Function
Serial Port E
Serial Port F
Transmit
PC6, PD6, PE6, PH6
PC2, PD2, PE2, PH2
Receive
PC7, PD7, PE7
PC3, PD3, PE3
Transmit
Clock
PC4, PD4, PE4, PH4
PC0, PD0, PE0, PH0
Receive Clock PC5, PD5, PE5, PH5
PC1, PD1, PE1, PH1
Register
Function
TAT2R
Serial Port E baud rate generation
TAT3R
Serial Port F baud rate generation
PCFR, PCAHR, PCALR
PDFR, PDAHR, PDALR
PEFR, PEAHR, PEALR
PHFR, PHAHR, PHALR
Alternate port output selection
TAT1R
Prescaler for TAT2R-TAT3R
TAPR
Prescaler for TAT1R
TACR
Input selection for TAT2R-TAT3R
Summary of Contents for 6000
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