ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 32

• Manufacturer Part Number: ATA6613
• Description: Ata6613
• Manufacturer: ATMEL Corporation

6.2.4.4
6.2.4.5
6.2.4.6
6.2.4.7
6.2.4.8
6.2.4.9
32
ATA6612/ATA6613
Port C (PC5:0)
PC6/RESET
Port D (PD7:0)
AV
AREF
ADC7:6 (TQFP and QFN Package Only)
CC
Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
PC5..0 output buffers have symmetrical drive characteristics with both high sink and source
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.
If the RSTDISBL Fuse is unprogrammed, PC6 is used as a 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.
The minimum pulse length is given in
to generate a Reset.
The various special features of Port C are elaborated in
101.
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port D output buffers have symmetrical drive characteristics with both high sink and source
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.
The various special features of Port D are elaborated in
104.
AV
connected to V
through a low-pass filter. Note that PC6..4 use digital supply voltage, V
AREF is the analog reference pin for the A/D converter.
In the TQFP and QFN package, ADC7:6 serve as analog inputs to the A/D converter. These
pins are powered from the analog supply and serve as 10-bit ADC channels.
CC
is the supply voltage pin for the A/D converter, PC3:0, and ADC7:6. I should be externally
CC
, even if the ADC is not used. If the ADC is used, it should be connected to V
Table 6-3 on page
“Alternate Functions of Port C” on page
“Alternate Functions of Port D” on page
47. Shorter pulses are not guaranteed
CC
.
9111C–AUTO–02/08
CC