Renesas M16C/6NK Informações Técnicas Página 385

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Rev.2.10 Apr 14, 2006 page 361 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 23. Usage Notes
If the CPU reads the ADi register (i = 0, 1) at the same time the conversion result is stored in the ADi register
after completion of A/D conversion, an incorrect value may be stored in the ADi register. This problem
occurs when a divide-by-n clock derived from the main clock or a sub clock is selected for CPU clock.
When operating in one-shot or single-sweep mode
Check to see that A/D conversion is completed before reading the target ADi register. (Check the IR bit in
the ADIC register to see if A/D conversion is completed.)
When operating in repeat mode or repeat sweep mode 0 or 1
Use the main clock for CPU clock directly without dividing it.
If A/D conversion is forcibly terminated while in progress by setting the ADST bit in the ADCON0 register to
0 (A/D conversion halted), the conversion result of the A/D converter is undefined. The contents of ADi
register irrelevant to A/D conversion may also become undefined. If while A/D conversion is underway the
ADST bit is set to 0 in a program, ignore the values of all ADi registers.
When setting the ADST bit to 0 in single sweep mode during A/D conversion and A/D conversion is aborted,
disable the interrupt before setting the ADST bit to 0.
The applied intermediate potential may cause more increase in power consumption than other analog input
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pins (AN0 to AN3, AN0_0 to AN0_7, and AN2_0 to AN2_7), since the AN4 to AN7 are used with the KI0 to
______
KI3.
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