ATmega16HVB Atmel Corporation, ATmega16HVB Datasheet - Page 135

• Manufacturer Part Number: ATmega16HVB
• Manufacturer: Atmel Corporation

Specifications of ATmega16HVB

• Flash (kbytes): 16 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 8 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 17
• Ext Interrupts: 15
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 1.9
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 4.0 to 25
• Operating Voltage (vcc): 4.0 to 25
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

8042D–AVR–10/11
The user must disable the External Protection Input in the BPCR register before the port can be
used as a normal port.
Also during the reset sequence, the External Protection Input may disable the FETs. Conse-
quently, if the External Protection feature is not used and DUVR mode is enabled in reset, the
External Protection input must be held low until disabled by SW.
It is recommended that the external interrupt on the External Protection Input port is configured
to ‘any edge’ to generate an interrupt to the microcontroller when using this feature, indicating
that the FET protection status has changed. By reading the pin register, the External Protection
status can be determined. If the pin register is set, it means that External Protection is trigged
and the FET control signals in FCSR (CFE, DFE and DUVRD) are overridden and the FETs are
disabled. In the opposite case, External Protection violation is not present.
To ensure a safe exit from the External Protection Input condition, the FETs and DUVR mode
should be disabled by SW when an External Protection condition is detected. This enables soft-
ware to completely control when the FETs are switched ON again.
Short pulses on the EXTPROT pin, for instance caused by temporary high voltages on the BATT
pin when connecting a charger, may trigger the External Protection Input (refer to
cuit” on page
re-enabled automatically once the External Protection condition disappears.
Figure 24-1. External protection input example.
INT0
FC SR [CFE]
FC SR [DFE]
PC 0
O C
O D
220). However if the SW does not take any action, the C-FET and D-FET will be
ATmega16HVB/32HVB
”Operating cir-
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