AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 66

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Timers: 1
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Height: 2.35 mm
• Length: 13 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7.6 mm
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.
9.1
66
I/O-Ports
Introduction
AT90PWM81
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 changing drive value (if config-
ured 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. All port pins have individu-
ally selectable pull-up resistors with a supply-voltage invariant resistance. All I/O pins have protection
diodes to both V
273
Figure 9-1.
All registers and bit references in this section are written in general form. A lower case “x” represents 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 Registers and bit locations are listed in
“Register Description for I/O-Ports”.
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 corresponding bit in the Data Register. In addi-
tion, 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 “Ports as General Digital I/O”. 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
module sections for a full description of the alternate functions.
Note that enabling the alternate function of some of the port pins does not affect the use of the other pins
in the port as general digital I/O.
for a complete list of parameters.
I/O Pin Equivalent Schematic
CC
and Ground as indicated in
Pxn
“Alternate Port Functions” on page
C
pin
Figure
9-1. Refer to
“Electrical Characteristics(1)” on page
"General Digital I/O" for
See Figure
R
Details
pu
71. Refer to the individual
Logic
7734P–AVR–08/10