ATtiny167 Atmel Corporation, ATtiny167 Datasheet - Page 222

• Manufacturer Part Number: ATtiny167
• Manufacturer: Atmel Corporation

Specifications of ATtiny167

• Flash (kbytes): 16 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.5
• 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: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

20.2.5
20.2.6
222
ATtiny87/ATtiny167
Preventing Flash Corruption
Programming Time for Flash when Using SPM
During periods of low V
too low for the CPU and the Flash to operate properly. These issues are the same as for board
level systems using the Flash, and the same design solutions should be applied.
A Flash program corruption can be caused by two situations when the voltage is too low.
Flash corruption can easily be avoided by following these design recommendations (one is
sufficient):
The calibrated RC Oscillator is used to time Flash accesses.
gramming time for Flash accesses from the CPU.
Table 20-2.
• First, a regular write sequence to the Flash requires a minimum voltage to operate
• Secondly, the CPU itself can execute instructions incorrectly, if the supply voltage for
1. Keep the AVR RESET active (low) during periods of insufficient power supply volt-
2. Keep the AVR core in Power-down sleep mode during periods of low V
Flash write (Page Erase, Page Write,
correctly.
executing instructions is too low.
age. This can be done by enabling the internal Brown-out Detector (BOD) if the
operating voltage matches the detection level. If not, an external low V
tection circuit can be used. If a reset occurs while a write operation is in progress, the
write operation will be completed provided that the power supply voltage is sufficient.
prevent the CPU from attempting to decode and execute instructions, effectively pro-
tecting the SPMCSR Register and thus the Flash from unintentional writes.
and write Lock bits by SPM)
SPM Programming Time
Symbol
CC
, the Flash program can be corrupted because the supply voltage is
Min Programming Time
3.7 ms
Table 20-2
Max Programming Time
shows the typical pro-
CC
CC
4.5 ms
reset pro-
. This will
8265B–AVR–09/10