ATTINY20-MMHR Atmel, ATTINY20-MMHR Datasheet - Page 217

• Manufacturer Part Number: ATTINY20-MMHR
• Description: MCU AVR 2KB FLASH 12MHZ 20QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-MMHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

26. Errata
26.1
8235B–AVR–04/11
Rev. A
The revision letters in this section refer to the revision of the corresponding ATtiny20 device.
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1. Lock bits re-programming
2.
Lock bits re-programming
MISO output driver is not disabled by Slave Select (SS) signal
MISO output driver is not disabled by Slave Select (SS) signal
Attempt to re-program Lock bits to present, or lower protection level (tampering attempt),
causes erroneously one, random line of Flash program memory to get erased. The Lock bits
will not get changed, as they should not.
Problem Fix / Workaround
Do not attempt to re-program Lock bits to present, or lower protection level.
When SPI is configured as a slave and the MISO pin is configured as an output the pin out-
put driver is constantly enabled, even when the SS pin is high. If other slave devices are
connected to the same MISO line this behaviour may cause drive contention.
Problem Fix / Workaround
Monitor SS pin by software and use the DDRB2 bit of DDRB to control the MISO pin driver.
ATtiny20
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