Rainbow Electronics ATA6286 - Manual (Page 6)

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4958AS–AUTO–09/06
ATA6285/ATA6286 [Preliminary]
2.5.4 Port C (PC2..0)
Port C is a 3-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port C output buffers have symmetrical drive characteristics with both high sink and source cur-
rent capability. As inputs, Port C pins that are externally pulled low will source current if the
pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes
active, even if the clock is not running.
2.5.5 Port D (PD7..0)
Port D is a 7(1)-bit bi-directional I/O port with internal pull-up resistors (selected for each bit).
The PD(6..3) pins are used as internal inter-die connection I/O ports. The Port D output buffers
have symmetrical drive characteristics with both high sink and source current capability. As
inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are
activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock
is not running.
Port D also serves the functions of various special features of the ATmegaT.
2.5.6 NRESET
Reset input. A low level on this pin for longer than the minimum pulse length will generate a
reset, even if the clock is not running. Shorter pulses then defined minimum pulse length are not
guaranteed to generate a reset.
2.5.7 LF (2..1)
Input coil pins for the LF-Receiver.
2.5.8 S (2..0)
Measuring input pins for external capacitance sensor elements.
2.5.9 ANT(2, 1)
RF-Antenna pins.
2.5.10 XTO(0, 1)
External crystal for the internal RF transmitter IC.