ATTINY28L-4AU Atmel, ATTINY28L-4AU Datasheet - Page 26

• Manufacturer Part Number: ATTINY28L-4AU
• Description: IC MCU AVR 2K FLASH 4MHZ 32-TQFP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY28L-4AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Processor Series: ATTINY2x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 32 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 11
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Package: 32TQFP
• Device Core: AVR
• Family Name: ATtiny
• Maximum Speed: 4 MHz
• Ram Size: 32 Byte
• Operating Supply Voltage: 3.3|5 V
• For Use With: ATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIPATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Ram Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

Port A Schematics
26
ATtiny28L/V
Note that all port pins are synchronized. The synchronization latches are, however, not
shown in the figures.
Figure 21. Port A Schematic Diagram (Pins PA0, PA1 and PA3)
Figure 22. Port A Schematic Diagram (Pin PA2)
PAn
PA2
WP:
Note: Both the flip-flops shown
have reset value one (set).
RL:
WRITE PORTA
READ PORTA LATCH
PULL-
MOS
UP
WP:
WD:
RP:
RD:
RL:
n:
WRITE PORTA
WRITE DDRA
READ PORTA LATCH
READ PORTA PIN
READ DDRA
0,1,3
MODULATOR
HARDWARE
Q
RESET
R
C
D
1
0
Q
RESET
R
C
D
RL
RP
RL
Q
PORTA2
RESET
WP
R
C
DISABLE
TOGGLE
CLEAR
D
SET
Q
Q
PORTAn
RESET
RESET
DDAn
OOM01
WD
WP
RD
C
R
R
C
TOV0
FOV0
0
0
1
1
D
D
1062F–AVR–07/06
OOM00
0
1
0
1