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R01UH0336EJ0102 Rev.1.02
Page 1278 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 23 A/D Converter
10. Monitor the following registers:
– ADCAnSTR1: Check whether A/D conversion results have been
overwritten before reading them out according to their use.
– ADCAnSTR0: Check whether A/D conversion results are within the
specified value range (only if the upper/lower limit comparison function
for A/D conversion results has been enabled).
11. Before you reconfigure the A/D converter, disable it by clearing
ADCAnCTL0.ADCAnCE to 0.
Note
The self-diagnosis functions are described in Section 23.3.11, Self-Diagnosis
Functions.
23.3.2
Clock Usage
The ADCAn clock ADCAnTCLK is derived from PCLK. The division ratio is
specified in ADCAnCTL1.ADCAnFR[1:0].
Caution
The maximum and minimum frequencies of ADCAnTCLK should be 48 MHz
and 24 MHz, respectively.
For frequency setting, see Table 23-3, Total Conversion Times (10- and 12-bit
Resolution).