ATtiny26 Atmel Corporation, ATtiny26 Datasheet - Page 72

• Manufacturer Part Number: ATtiny26
• Manufacturer: Atmel Corporation

Specifications of ATtiny26

• Flash (kbytes): 2 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 11
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

Timer/Counter1 –
TCNT1
Timer/Counter1
Output Compare
RegisterA – OCR1A
72
ATtiny26(L)
• Bits 3..0 – CS13, CS12, CS11, CS10: Clock Select Bits 3, 2, 1, and 0
The Clock Select bits 3, 2, 1, and 0 define the prescaling source of Timer/Counter1.
Table 34. Timer/Counter1 Prescale Select
The Stop condition provides a Timer Enable/Disable function.
This 8-bit register contains the value of Timer/Counter1.
Timer/Counter1 is realized as an up counter with read and write access. Due to synchronization
of the CPU, Timer/Counter1 data written into Timer/Counter1 is delayed by one CPU clock cycle
in synchronous mode and at most two CPU clock cycles for asynchronous mode.
The Output Compare Register A is an 8-bit read/write register.
The Timer/Counter Output Compare Register A contains data to be continuously compared with
Timer/Counter1. Actions on compare matches are specified in TCCR1A. A compare match does
only occur if Timer/Counter1 counts to the OCR1A value. A software write that sets TCNT1 and
OCR1A to the same value does not generate a compare match.
Bit
$2E ($4E)
Read/Write
Initial Value
Bit
$2D ($4D)
Read/Write
Initial Value
CS13
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
CS12
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
MSB
MSB
R/W
R/W
7
0
7
0
CS11
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
R/W
R/W
6
0
6
0
CS10
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
R/W
R/W
5
0
5
0
Description
Asynchronous Mode
Timer/Counter1 is stopped.
PCK
PCK/2
PCK/4
PCK/8
PCK/16
PCK/32
PCK/64
PCK/128
PCK/256
PCK/512
PCK/1024
PCK/2048
PCK/4096
PCK/8192
PCK/16384
R/W
R/W
4
0
4
0
R/W
R/W
3
0
3
0
R/W
R/W
2
0
2
0
Description
Synchronous Mode
Timer/Counter1 is stopped.
CK
CK/2
CK/4
CK/8
CK/16
CK/32
CK/64
CK/128
CK/256
CK/512
CK/1024
CK/2048
CK/4096
CK/8192
CK/16384
R/W
R/W
1
0
1
0
LSB
R/W
LSB
R/W
0
0
0
0
OCR1A
TCNT1
1477K–AVR–08/10