ATTINY25-20SU Atmel, ATTINY25-20SU Datasheet - Page 62

• Manufacturer Part Number: ATTINY25-20SU
• Description: IC AVR MCU 2K 20MHZ 8-SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY25-20SU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Processor Series: ATTINY2x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: USI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Operating Supply Voltage: 2.7 V to 5.5 V
• 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: 4-ch x 10-bit
• For Use With: ATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIPATAVRBC100 - REF DESIGN KIT BATTERY CHARGER770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATAVRISP2 - PROGRAMMER AVR IN SYSTEMATJTAGICE2 - AVR ON-CHIP D-BUG SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.3.1
62
ATtiny25/45/85
Alternate Functions of Port B
The following subsections shortly describe the alternate functions for each port, and relate the
overriding signals to the alternate function. Refer to the alternate function description for further
details.
The Port B pins with alternate function are shown in
Table 10-3.
• Port B, Bit 5 – RESET/dW/ADC0/PCINT5
• RESET: External Reset input is active low and enabled by unprogramming (“1”) the
• dW: When the debugWIRE Enable (DWEN) Fuse is programmed and Lock bits are
RSTDISBL Fuse. Pullup is activated and output driver and digital input are deactivated when
the pin is used as the RESET pin.
unprogrammed, the debugWIRE system within the target device is activated. The RESET
Port Pin
PB5
PB4
PB3
PB2
PB1
PB0
Port B Pins Alternate Functions
Alternate Function
RESET: Reset Pin
dW:
ADC0:
PCINT5: Pin Change Interrupt, Source 5
XTAL2: Crystal Oscillator Output
CLKO: System Clock Output
ADC2:
OC1B: Timer/Counter1 Compare Match B Output
PCINT4: Pin Change Interrupt 0, Source 4
XTAL1: Crystal Oscillator Input
CLKI:
ADC3:
OC1B: Complementary Timer/Counter1 Compare Match B Output
PCINT3: Pin Change Interrupt 0, Source 3
SCK:
ADC1:
T0:
USCK: USI Clock (Three Wire Mode)
SCL :
INT0:
PCINT2: Pin Change Interrupt 0, Source 2
MISO:
AIN1:
OC0B: Timer/Counter0 Compare Match B Output
OC1A: Timer/Counter1 Compare Match A Output
DO:
PCINT1:Pin Change Interrupt 0, Source 1
MOSI:: SPI Master Data Output / Slave Data Input
AIN0:
OC0A: Timer/Counter0 Compare Match A output
OC1A: Complementary Timer/Counter1 Compare Match A Output
DI:
SDA:
AREF:
PCINT0: Pin Change Interrupt 0, Source 0
debugWIRE I/O
ADC Input Channel 0
ADC Input Channel 2
External Clock Input
ADC Input Channel 3
Serial Clock Input
ADC Input Channel 1
Timer/Counter0 Clock Source
USI Clock (Two Wire Mode)
External Interrupt 0 Input
SPI Master Data Input / Slave Data Output
Analog Comparator, Negative Input
USI Data Output (Three Wire Mode)
Analog Comparator, Positive Input
USI Data Input (Three Wire Mode)
USI Data Input (Two Wire Mode)
External Analog Reference
Table
10-3.
2586M–AVR–07/10