ATTINY85V-10MUR View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATTINY85V-10MUR

Atmel 8-bit AVR Microcontroller with 2/4/8K Bytes In-System Programmable Flash

Atmel Corporation 

8.2.3

Rev B – C

• PLL not locking

• EEPROM read from application code does not work in Lock Bit Mode 3

• EEPROM read may fail at low supply voltage / low clock frequency

• Timer Counter 1 PWM output generation on OC1B- XOC1B does not work correctly

1. PLL not locking

When at frequencies below 6.0 MHz, the PLL will not lock

Problem fix / Workaround

When using the PLL, run at 6.0 MHz or higher.

2. EEPROM read from application code does not work in Lock Bit Mode 3

When the Memory Lock Bits LB2 and LB1 are programmed to mode 3, EEPROM read does not work from the

application code.

Problem Fix/Work around

Do not set Lock Bit Protection Mode 3 when the application code needs to read from EEPROM.

3. EEPROM read may fail at low supply voltage / low clock frequency

Trying to read EEPROM at low clock frequencies and/or low supply voltage may result in invalid data.

Problem Fix/Workaround

Do not use the EEPROM when clock frequency is below 1MHz and supply voltage is below 2V. If operating fre-

quency can not be raised above 1MHz then supply voltage should be more than 2V. Similarly, if supply voltage

can not be raised above 2V then operating frequency should be more than 1MHz.

This feature is known to be temperature dependent but it has not been characterised. Guidelines are given for

room temperature, only.

4. Timer Counter 1 PWM output generation on OC1B – XOC1B does not work correctly

Timer Counter1 PWM output OC1B-XOC1B does not work correctly. Only in the case when the control bits,

COM1B1 and COM1B0 are in the same mode as COM1A1 and COM1A0, respectively, the OC1B-XOC1B out-

put works correctly.

Problem Fix/Work around

The only workaround is to use same control setting on COM1A[1:0] and COM1B[1:0] control bits, see table 14-

4 in the data sheet. The problem has been fixed for Tiny45 rev D.

8.2.4

Rev A

• Too high power down power consumption

• DebugWIRE looses communication when single stepping into interrupts

• PLL not locking

• EEPROM read from application code does not work in Lock Bit Mode 3

• EEPROM read may fail at low supply voltage / low clock frequency

1. Too high power down power consumption

Three situations will lead to a too high power down power consumption. These are:

– An external clock is selected by fuses, but the I/O PORT is still enabled as an output.

– The EEPROM is read before entering power down.

– VCC is 4.5 volts or higher.

Problem fix / Workaround

ATtiny25/45/85 [DATASHEET] 20

2586PS–AVR–06/2013

Share Link: