ATtiny40 Atmel Corporation, ATtiny40 Datasheet - Page 90

• Manufacturer Part Number: ATtiny40
• Manufacturer: Atmel Corporation

Specifications of ATtiny40

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 18
• Ext Interrupts: 18
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

12.9
90
Accessing Registers in 16-bit Mode
ATtiny40
Figure 12-6. Timer/Counter Timing Diagram, with Prescaler (f
Figure 12-7 on page 90
Figure 12-7. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f
Figure 12-8
Figure 12-8. Timer/Counter Timing Diagram, CTC mode, with Prescaler (f
In 16-bit mode (the TCW1 bit is set to one) the TCNT1H/L and OCR1A/B or TCNT1L/H and
OCR1B/A are 16-bit registers that can be accessed by the AVR CPU via the 8-bit data bus. The
16-bit register must be byte accessed using two read or write operations. The 16-bit
Timer/Counter has a single 8-bit register for temporary storing of the high byte of the 16-bit
TCNTn
TCNTn
(clk
(clk
OCRnx
TCNTn
OCFnx
(clk
OCRnx
TOVn
(CTC)
OCFnx
clk
clk
clk
clk
clk
clk
I/O
I/O
PCK
I/O
Tn
I/O
Tn
PCK
Tn
/8)
/8)
/8)
shows the setting of OCF1A and the clearing of TCNT1 in CTC mode.
OCRnx - 1
MAX - 1
TOP - 1
shows the setting of OCF1A and OCF1B in Normal mode.
OCRnx
TOP
MAX
OCRnx Value
TOP
BOTTOM
clk_I/O
OCRnx + 1
BOTTOM
/8)
clk_I/O
/8)
BOTTOM + 1
BOTTOM + 1
clk_I/O
8263A–AVR–08/10
OCRnx + 2
/8)