ATMEGA163_14 Datasheet, PDF (181/187 Pages) ATMEL Corporation – Nonvolatile Program and Data Memories

ATmega163(L)
Problem Fix/Workaround
Ensure at least one instruction (e.g., nop) is executed between two writes to TWCR.
2. PWM not Phase Correct
In Phase-correct PWM mode, a change from OCRx = TOP to anything less than
TOP does not change the OCx output. This gives a phase error in the following
period.
Problem Fix/Workaround
Make sure this issue is not harmful to the application.
1. TWI is Speed Limited in Slave Mode
When the two-wire Serial Interface operates in Slave mode, frames may be unde-
tected if the CPU frequency is less than 64 times the bus frequency.
Problem Fix/Workaround
Ensure that the CPU frequency is at least 64 times the TWI bus frequency.
1142E–AVR–02/03
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