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Rabbit 6000 User’s Manual
digi.com
188
19.2 Dependencies
19.2.1 I/O Pins
Serial Port A can transmit on parallel port pins PC7, PC6, or PD6, and can receive on pins PC7, PD7, or
PE7. If the clocked serial mode is enabled, the serial clock is either transmitted or received on PB1. When
an internal clock is selected in the clocked serial mode, PB1 is automatically enabled as a clock output.
Serial Port B can transmit on parallel port pins PC5, PC4, or PD4, and can receive on pins PC5, PD5, or
PE5. If the clocked serial mode is enabled, the serial clock is either transmitted or received on PB0. When
an internal clock is selected in the clocked serial mode, PB0 is automatically enabled as a clock output.
Serial Port C can transmit on parallel port pins PC3 or PC2, and can receive on pins PC3, PD3, or PE3. If
the clocked serial mode is enabled, the serial clock can be transmitted on PC7, PD7, PD2, or PE7, and can
be received on PD2 or PE2.
Serial Port D can transmit on parallel port pins PC1 or PC0, and can receive on pins PC1, PD1, or PE1. If
the clocked serial mode is enabled, the serial clock can be transmitted on PC3, PD3, PD0, or PE3, and can
be received on PD0 or PE0.
19.2.2 Clocks
The data clocks for Serial Ports A – D are based on the peripheral clock and are 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
selected register plus one.
Table 19-2. Pin Usage Serial Ports A – D
Function
Serial Port A
Serial Port B
Serial Port C
Serial Port D
Transmit
PC7, PC6, PD6
PC5, PC4, PD4
PC3, PC2
PC1, PC0
Receive
PC7, PD7, PE7
PC5, PD5, PE5
PC3, PD3, PE3
PC1, PD1, PE1
Transmit
Clock
PB1
PB0
PC7, PD7, PD2,
PE7, PF7, PG7,
PH7
PC3, PD3, PD0,
PE3, PF3, PG3,
PH3
Receive Clock
PB1
PB0
PD2, PE2
PD0, PE0
Summary of Contents for 6000
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