ATMEGA16U4-AU Atmel, ATMEGA16U4-AU Datasheet - Page 72

• Manufacturer Part Number: ATMEGA16U4-AU
• Description: MCU AVR 16K FLASH USB 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16U4-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 26
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: ATMEGA16x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 1.25 KB
• Interface Type: SPI, TWI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 26
• Number Of Timers: 5
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 12 Channel
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVRATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.3.1
10.3.2
7766F–AVR–11/10
MCU Control Register – MCUCR
Alternate Functions of Port B
• Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See
figuring the Pin” on page 66
The Port B pins with alternate functions are shown in
Table 10-3.
The alternate pin configuration is as follows:
• OC0A/OC1C/PCINT7/RTS, Bit 7
OC0A, Output Compare Match A output: The PB7 pin can serve as an external output for the
Timer/Counter0 Output Compare. The pin has to be configured as an output (DDB7 set “one”) to
serve this function. The OC0A pin is also the output pin for the PWM mode timer function.
OC1C, Output Compare Match C output: The PB7 pin can serve as an external output for the
Timer/Counter1 Output Compare C. The pin has to be configured as an output (DDB7 set “one”)
to serve this function. The OC1C pin is also the output pin for the PWM mode timer function.
PCINT7, Pin Change Interrupt source 7: The PB7 pin can serve as an external interrupt source.
RTS: RTS flow control signal used by enhanced UART.
Bit
Read/Write
Initial Value
Port Pin
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
7
JTD
R/W
0
Alternate Functions
OC0A/OC1C/PCINT7/RTS (Output Compare and PWM Output A for
Timer/Counter0, Output Compare and PWM Output C for Timer/Counter1 or Pin
Change Interrupt 7 or UART flow control RTS signal)
OC1B/PCINT6/OC.4B/ADC13 (Output Compare and PWM Output B for
Timer/Counter1 or Pin Change Interrupt 6 or Timer 4 Output Compare B / PWM
output or Analog to Digital Converter channel 13)
OC1A/PCINT5/OC.4B/ADC12 (Output Compare and PWM Output A for
Timer/Counter1 or Pin Change Interrupt 5 or Timer 4 Complementary Output
Compare B / PWM output or Analog to Digital Converter channel 12)
PCINT4/ADC11 (Pin Change Interrupt 4 or Analog to Digital Converter channel 11)
PDO/MISO/PCINT3 (Programming Data Output or SPI Bus Master Input/Slave
Output or Pin Change Interrupt 3)
PDI/MOSI/PCINT2 (Programming Data Input or SPI Bus Master Output/Slave Input
or Pin Change Interrupt 2)
SCK/PCINT1 (SPI Bus Serial Clock or Pin Change Interrupt 1)
SS/PCINT0 (SPI Slave Select input or Pin Change Interrupt 0)
Port B Pins Alternate Functions
6
–
R
0
for more details about this feature.
5
–
R
0
4
PUD
R/W
0
3
–
R
0
Table
2
–
R
0
10-3.
1
IVSEL
R/W
0
ATmega16/32U4
0
IVCE
R/W
0
MCUCR
“Con-
72