ATA8743 ATMEL Corporation, ATA8743 Datasheet - Page 72

• Manufacturer Part Number: ATA8743
• Manufacturer: ATMEL Corporation

19. I/O Ports
19.1
72
Overview
ATA8743
All AVR ports have true Read-Modify-Write functionality when used as general digital I/O ports.
This means that the direction of one port pin can be changed without unintentionally changing
the direction of any other pin with the SBI and CBI instructions. The same applies when chang-
ing drive value (if configured as output) or enabling/disabling of pull-up resistors (if configured as
input). Each output buffer has symmetrical drive characteristics with both high sink and source
capability. The pin driver is strong enough to drive LED displays directly. All port pins have indi-
vidually selectable pull-up resistors with a supply-voltage invariant resistance. All I/O pins have
protection diodes to both V
cal Characteristics” on page 195
Figure 19-1. I/O Pin Equivalent Schematic
All registers and bit references in this section are written in general form. A lower case “x” repre-
sents the numbering letter for the port, and a lower case “n” represents the bit number. However,
when using the register or bit defines in a program, the precise form must be used. For example,
PORTB3 for bit no. 3 in Port B, here documented generally as PORTxn. The physical I/O Regis-
ters and bit locations are listed in
page
Three I/O memory address locations are allocated for each port, one each for the Data Register
– PORTx, Data Direction Register – DDRx, and the Port Input Pins – PINx. The Port Input Pins
I/O location is read only, while the Data Register and the Data Direction Register are read/write.
However, writing a logic one to a bit in the PINx Register, will result in a toggle in the correspond-
ing bit in the Data Register. In addition, the Pull-up Disable – PUD bit in MCUCR disables the
pull-up function for all pins in all ports when set.
Using the I/O port as General Digital I/O is described in
73. Most port pins are multiplexed with alternate functions for the peripheral features on the
device. How each alternate function interferes with the port pin is described in
Functions” on page
nate functions.
86.
Pxn
77. Refer to the individual module sections for a full description of the alter-
CC
and Ground as indicated in
for a complete list of parameters.
“EXT_CLOCK = external clock is selected as system clock.” on
C
pin
“Ports as General Digital I/O” on page
Figure 19-1 on page
"General Digital I/O" for
See Figure
R
Details
pu
Logic
72. See
9152A–INDCO–07/09
“Alternate Port
“Electri-