ATMEGA64M1-15MZ Atmel, ATMEGA64M1-15MZ Datasheet - Page 114

• Manufacturer Part Number: ATMEGA64M1-15MZ
• Description: MCU AVR 64KB FLASH 3PSC 32-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64M1-15MZ

• Package / Case: 32-VQFN
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Connectivity: CAN, LIN, SPI, UART/USART
• Core Size: 8-Bit
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATADAPCAN01
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Lead Free Status / Rohs Status: Details

13.5
114
Input Capture Unit
Atmel ATmega16/32/64/M1/C1
The Timer/Counter Overflow Flag (TOVn) is set according to the mode of operation selected
by the WGMn3:0 bits. TOVn can be used for generating a CPU interrupt.
The Timer/Counter incorporates an Input Capture unit that can capture external events and
give them a time-stamp indicating time of occurrence. The external signal indicating an event,
or multiple events, can be applied via the ICPn pin or alternatively, via the analog-comparator
unit. The time-stamps can then be used to calculate frequency, duty-cycle, and other features
of the signal applied. Alternatively the time-stamps can be used for creating a log of the
events.
The Input Capture unit is illustrated by the block diagram shown in
of the block diagram that are not directly a part of the Input Capture unit are gray shaded. The
small “n” in register and bit names indicates the Timer/Counter number.
Figure 13-3. Input Capture Unit Block Diagram
When a change of the logic level (an event) occurs on the Input Capture pin (ICPn), alterna-
tively on the Analog Comparator output (ACO), and this change confirms to the setting of the
edge detector, a capture will be triggered. When a capture is triggered, the 16-bit value of the
counter (TCNTn) is written to the Input Capture Register (ICRn). The Input Capture Flag
(ICFn) is set at the same system clock as the TCNTn value is copied into ICRn Register. If
enabled (ICIEn = 1), the Input Capture Flag generates an Input Capture interrupt. The ICFn
Flag is automatically cleared when the interrupt is executed. Alternatively the ICFn Flag can
be cleared by software by writing a logical one to its I/O bit location.
Reading the 16-bit value in the Input Capture Register (ICRn) is done by first reading the low
byte (ICRnL) and then the high byte (ICRnH). When the low byte is read the high byte is cop-
ied into the high byte temporary register (TEMP). When the CPU reads the ICRnH I/O location
it will access the TEMP Register.
ICPnB
ICPnA
Analog Comparator 1 Interrupt
WRITE
ICRnH (8-bit)
TEMP (8-bit)
ICPSEL1
ICRn (16-bit Register)
ICRnL (8-bit)
AC1ICE
DATA BUS
Canceler
ICNC
Noise
(8-bit)
TCNTnH (8-bit)
TCNTn (16-bit Counter)
Detector
ICES
Edge
Figure
TCNTnL (8-bit)
13-3. The elements
ICFn (Int.Req.)
7647G–AVR–09/11