ATTINY167-15XZ Atmel, ATTINY167-15XZ Datasheet - Page 222

• Manufacturer Part Number: ATTINY167-15XZ
• Description: MCU AVR 16K FLASH 15MHZ 20-TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY167-15XZ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, LIN, SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 16
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-TSSOP
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20.2.5
20.2.6
222
ATtiny87/ATtiny167
Preventing Flash Corruption
Programming Time for Flash when Using SPM
During periods of low Vcc, the Flash program can be corrupted because the supply voltage is
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 voltage.
2. Keep the AVR core in Power-down sleep mode during periods of low Vcc. This will
Flash write (Page Erase, Page Write,
correctly.
executing instructions is too low.
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 Vcc reset protection circuit
can be used. If a reset occurs while a write operation is in progress, the write opera-
tion 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
Min Programming Time
3.7 ms
Table 20-2
Max Programming Time
shows the typical pro-
4.5 ms
7728G–AVR–06/10