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ATMEGA64 Datasheet(PDF) 17 Page - ATMEL Corporation

Part No. ATMEGA64
Description  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
Download  23 Pages
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA64 Datasheet(HTML) 17 Page - ATMEL Corporation

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ATmega64(L)
2490LS–AVR–10/06
Errata
The revision letter in this section refers to the revision of the ATmega64 device.
ATmega64, rev. A to C
First Analog Comparator conversion may be delayed
Interrupts may be lost when writing the timer registers in the asynchronous timer
Stabilizing time needed when changing XDIV Register
Stabilizing time needed when changing OSCCAL Register
IDCODE masks data from TDI input
1.
First Analog Comparator conversion may be delayed
If the device is powered by a slow rising V
CC, the first Analog Comparator conver-
sion will take longer than expected on some devices.
Problem Fix/Workaround
When the device has been powered or reset, disable then enable theAnalog Com-
parator before the first conversion.
2.
Interrupts may be lost when writing the timer registers in the asynchronous
timer
If one of the timer registers which is synchronized to the asynchronous timer2 clock
is written in the cycle before a overflow interrupt occurs, the interrupt may be lost.
Problem Fix/Workaround
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the
value 0xFF before writing the Timer2 Control Register, TCCR2, or Output Compare
Register, OCR2
3.
Stabilizing time needed when changing XDIV Register
After increasing the source clock frequency more than 2% with settings in the XDIV
register, the device may execute some of the subsequent instructions incorrectly.
Problem Fix / Workaround
The NOP instruction will always be executed correctly also right after a frequency
change. Thus, the next 8 instructions after the change should be NOP instructions.
To ensure this, follow this procedure:
1.Clear the I bit in the SREG Register.
2.Set the new pre-scaling factor in XDIV register.
3.Execute 8 NOP instructions
4.Set the I bit in SREG
This will ensure that all subsequent instructions will execute correctly.
Assembly Code Example:
CLI
; clear global interrupt enable
OUT
XDIV, temp
; set new prescale value
NOP
; no operation
NOP
; no operation
NOP
; no operation
NOP
; no operation
NOP
; no operation
NOP
; no operation
NOP
; no operation
NOP
; no operation
SEI
; clear global interrupt enable


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