ST7FLITE29 STMICROELECTRONICS [STMicroelectronics], ST7FLITE29 Datasheet - Page 129

• Manufacturer Part Number: ST7FLITE29
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

16 IMPORTANT NOTES
16.1 EXECUTION OF BTJX INSTRUCTION
When testing the address $FF with the
"BTJT" or "BTJF" instructions, the CPU may
perform an incorrect operation when the rel-
ative jump is negative and performs an ad-
dress page change.
To avoid this issue, including when using a C
compiler, it is recommended to never use ad-
dress $00FF as a variable (using the linker
parameter for example).
16.2 ADC CONVERSION SPURIOUS RESULTS
Spurious conversions occur with a rate lower
than 50 per m illi on. Such convers ions
happen when the measured voltage is just
between 2 consecutive digital values.
Workaround
A software filter should be implemented to
remove erratic conversion results whenever
they may cause unwanted consequences.
16.3 A/ D CONVERTER ACCURACY FOR FIRST
CONVERSION
When the ADC is enabled after being pow-
ered down (for example when waking up
from HALT, ACTIVE-HALT or setting the
ADON bit in the ADCCSR register), the first
conversion (8-bit or 10-bit) accuracy does
not meet the accuracy specified in the da-
tasheet.
Workaround
In order to have the accuracy specified in the
datasheet, the first conversion after a ADC
switch-on has to be ignored.
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