ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 139
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ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U4
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
14
Hardware Qtouch Acquisition
No
Max I/o Pins
26
Ext Interrupts
13
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
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)
3.3
Eeprom (bytes)
1024
Self Program Memory
YES
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
4
Output Compare Channels
12
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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- Current page: 139 of 433
- Download datasheet (9Mb)
15.2.1
15.2.2
7766F–AVR–11/10
Speed
Accuracy
Figure 15-1. Timer/Counter4 Block Diagram
The maximum speed of the Timer/Counter4 is 64 MHz. However, if a supply voltage below 4
volts is used, it is recommended to decrease the input frequency, because the Timer/Counter4
is not running fast enough on low voltage levels.
The Timer/Counter4 is a 10-bit Timer/Counter module that can alternatively be used as an 8-bit
Timer/Counter. The Timer/Counter4 registers are basically 8-bit registers, but on top of that
there is a 2-bit High Byte Register (TC4H) that can be used as a common temporary buffer to
access the two MSBs of the 10-bit Timer/Counter4 registers by the AVR CPU via the 8-bit data
bus, if the 10-bit accuracy is used. Whereas, if the two MSBs of the 10-bit registers are written to
zero the Timer/Counter4 is working as an 8-bit Timer/Counter. When reading the low byte of any
8-bit register the two MSBs are written to the TC4H register, and when writing the low byte of
any 8-bit register the two MSBs are written from the TC4H register. Special procedures must be
followed when accessing the 10-bit Timer/Counter4 values via the 8-bit data bus. These proce-
dures are described in the section
The Enhanced PWM mode allows to add a resolution bit to each Compare register A/B/D, while
the output frequency remains identical to a Normal PWM mode. That means that the TC4H reg-
ister contains one more bit that will be the MSB in a 11-bits enhanced PWM operation. See the
section
use it.
REGISTER (TIMSK4)
TOV4
T/C INT. MASK
TIMER/COUNTER4
(TCNT4)
8-BIT OUTPUT COMPARE
COMPARE REGISTER A
REGISTER A (OCR4A)
10-BIT COMPARATOR
10-BIT OUTPUT
“Enhanced Compare/PWM mode” on page 148
OCF4A
OCF4B
T/C INT. FLAG
REGISTER (TIFR4)
CLK
COUNT
CLEAR
DIRECTION
OCF4D
8-BIT OUTPUT COMPARE
REGISTER B (OCR4B)
COMPARE REGISTER B
10-BIT COMPARATOR
10-BIT OUTPUT
DEAD TIME GENERATOR
OC4A
REGISTER A (TCCR4A)
“Accessing 10-Bit Registers” on page
T/C CONTROL
8-BIT DATABUS
OC4A
8-BIT OUTPUT COMPARE
REGISTER C (OCR4C)
COMPARE REGISTER C
10-BIT COMPARATOR
10-BIT OUTPUT
DEAD TIME GENERATOR
T/C CONTROL
OC4B
REGISTER B (TCCR4B)
TIMER/COUNTER4 CONTROL LOGIC
for details about this feature and how to
OC4B
8-BIT OUTPUT COMPARE
COMPARE REGISTER D
REGISTER D (OCR4D)
10-BIT OUTPUT
10-BIT COMPARATOR
T/C CONTROL
REGISTER C (TCCR4C)
ATmega16/32U4
DEAD TIME GENERATOR
OC4D
159.
OC4D
2-BIT HIGH BYTE
REGISTER (TC4H)
T/C CONTROL
T/C CONTROL
REGISTER C (TCCR4D)
REGISTER D (TCCR4E)
FAULT_PROTECTION
139
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