ATTINY40-MMHR Atmel, ATTINY40-MMHR Datasheet - Page 90

• Manufacturer Part Number: ATTINY40-MMHR
• Description: MCU AVR 4KB FLASH 12MHZ 3X3 QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY40-MMHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 18
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

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)