ATMEGA169-16MISL709 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA169-16MISL709

8-bit Microcontroller with 16K Bytes In-System Programmable Flash

Atmel Corporation 

2514KS–AVR–05/04

ATmega169/V

Problem Fix/Workaround

Contrast will be wrong, but display will still be readable, can be partly compensated

for using the contrast control register (this will be fixed in rev. C).

5. External Oscillator is Non-functional

The external oscillator does not run with the setup described in the datasheet.

Problem Fix/Workaround

Use other clock source (this will be fixed in rev. C).

Alternative Problem Fix/Workaround

Adding a pull-down on XTAL1 will start the Oscillator.

4. USART

Writing TXEN to zero during transmission causes the transmission to suddenly stop.

The datasheet description tells that the transmission should complete before stop-

ping the USART when TXEN is written to zero.

Problem Fix/Workaround

Ensure that the transmission is complete before writing TXEN to zero (this will be

fixed in rev. C).

3. ADC Measures with Lower Accuracy than Specified

The ADC does not work as intended. There is a positive offset in the result.

Problem Fix/Workaround

This will be fixed in rev. C.

2. Serial downloading

When entering Serial Programming mode the second byte will not echo back as

described in the Serial Programming algorithm.

Problem Fix/Workaround

Check if the third byte echoes back to ensure that the device is in Programming

mode (this will be fixed in rev. C).

1. IDCODE masks data from TDI input

The JTAG instruction IDCODE is not working correctly. Data to succeeding devices

are replaced by all-ones during Update-DR.

Problem Fix / Workaround

– If ATmega169 is the only device in the scan chain, the problem is not visible.

– Select the Device ID Register of the ATmega169 by issuing the IDCODE

instruction or by entering the Test-Logic-Reset state of the TAP controller to

read out the contents of its Device ID Register and possibly data from

succeeding devices of the scan chain. Issue the BYPASS instruction to the

ATmega169 while reading the Device ID Registers of preceding devices of

the boundary scan chain.

– If the Device IDs of all devices in the boundary scan chain must be captured

simultaneously, the ATmega169 must be the fist device in the chain.

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