ATTINY28V-1MU Atmel, ATTINY28V-1MU Datasheet - Page 27
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ATTINY28V-1MU
Manufacturer Part Number
ATTINY28V-1MU
Description
IC MCU AVR 2K 1.8V 1.2MHZ 32-QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY28V-1MU
Core Processor
AVR
Core Size
8-Bit
Speed
1.2MHz
Peripherals
POR, WDT
Number Of I /o
11
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Processor Series
ATTINY2x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
32 B
Maximum Clock Frequency
1.2 MHz
Number Of Programmable I/os
11
Number Of Timers
1
Operating Supply Voltage
1.8 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
8 bit
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 B
Port B as General Digital Input All eight pins in Port B have equal functionality when used as digital input pins.
Alternate Functions of Port B
1062F–AVR–07/06
Port B is an 8-bit input port.
One I/O address location is allocated for the Port B Input Pins – PINB, $16. The Port B
Input Pins address is read-only.
All port pins have pull-ups that can be switched on for all Port B pins simultaneously. If
any of the Port B special functions is enabled, the corresponding pull-up(s) is disabled.
When pins PB0 to PB7 are externally pulled low, they will source current (I
nal pull-up resistors are activated.
The Port B pins with alternate functions are shown in Table 11.
Table 11. Port B Pin Alternate Functions
PBn, general input pin: To switch the pull-up resistors on, the PLUPB bit in the MCUCS
register must be set (one). This bit controls the pull-up on all Port B pins. To turn the
pull-ups off, this bit has to be cleared (zero). Note that if any Port B pins are used for
alternate functions, the pull-up on the corresponding pins are disabled. The port pins are
tri-stated when a reset condition becomes active, even if the clock is not running.
All Port B pins are connected to a low-level detector that can trigger the low-level input
interrupt. See “Low-level Input Interrupt” on page 21 for details. In addition, Port B has
the following alternate functions:
• INT1 – Port B, Bit 4
INT1, External Interrupt source 1. The PB4 pin can serve as an external interrupt source
to the MCU. See the interrupt description for details on how to enable and configure this
interrupt. If the interrupt is enabled, the pull-up resistor on PB4 is disabled and PB4 will
not give low-level interrupts.
• INT0 – Port B, Bit 3
INT0, External Interrupt source 0. The PB3 pin can serve as an external interrupt source
to the MCU. See the interrupt description for details on how to enable and configure this
interrupt. If the interrupt is enabled, the pull-up resistor on PB3 is disabled and PB3 will
not give low-level interrupts.
• T0 – Port B, Bit 2
T0, Timer/Counter0 Counter source. See the timer description for further details. If T0 is
used as the counter source, the pull-up resistor on PB2 is disabled and PB2 will not give
low-level interrupts.
Port Pin
PB0
PB1
PB2
PB3
PB4
Alternate Functions
AIN0 (Analog Comparator Positive Input)
AIN1 (Analog Comparator Negative Input)
T0 (Timer/Counter 0 External Counter Input)
INT0 (External Interrupt 0 Input)
INT1 (External Interrupt 1 Input)
ATtiny28L/V
IL
) if the inter-
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