Rabbit 6000 User’s Manual
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12.2 Dependencies
12.2.1 I/O Pins
Parallel Port E uses the pins PE0 through PE7. These pins can be used individually as data inputs or out-
puts; as serial port transmit and receive for Serial Ports E and F; as clocks for Serial Ports C–F; as data and
clocks for I
2
C (Serial Port G); as external I/O strobes; as outputs for the PWM and Timer C peripherals; or
as power control signals for the USB peripheral. The input capture peripheral can also watch pins PE7,
PE5, PE3, and PE1. There is also an option to provide the slave port chip select on PE7.
All pins are set as inputs on startup.
The individual bits can be set to be open-drain via PEDCR. Drive strength, slew rate, and the pullup/down
resistor status are selectable via PExCR.
See the associated peripheral chapters for details on how they use Parallel Port E.
12.2.2 Clocks
All outputs on Parallel Port E are clocked by the peripheral clock unless changed in PECR, where the
option of updating the Parallel Port E pins can be synchronized to the output of Timer A1, Timer B1, or
Timer B2.
12.2.3 Other Registers
12.2.4 Interrupts
External interrupts can be accepted from pins PE5, PE4, PE1 or PE0; see Chapter 7 for more details.
Register
Function
SACR, SBCR, SCCR,
SDCR, SECR, SFCR
Select a Parallel Port E pin as serial data (and
optional clock) input.
ICS1R, ICS2R
Select a Parallel Port E pin as a start/stop
condition for Input Capture input.
QDCR
Select a Parallel Port E pin as a Quadrature
Decoder input.
I0CR, I1CR
Select a Parallel Port E pin as an external
interrupt input.
DMR0CR, DMR1CR
Select a Parallel Port E pin as an external DMA
request input.
SPCR
Select slave chip select on PE7.
IHCR, IHSR, IHTR
Select a Parallel Port E pin for I/O handshake.
USBWR
Enable USB overcurrent detection on PE3.
Summary of Contents for 6000
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