RX610 Group
23. A/D Converter
R01UH0032EJ0120 Rev.1.20
Page 801 of 1006
Feb 20, 2013
23.6
Usage Notes
23.6.1
Module Stop Function Setting
Operation of the A/D converter can be disabled or enabled for each unit using the module stop control register. The initial
setting is for operation of the A/D converter to be halted. Register access is enabled by clearing the module stop state. For
details, see section 8, Low Power Consumption.
23.6.2
Notes on Disabling A/D Conversion
To disable A/D conversion when an external trigger or timer has been selected as the condition for starting A/D
conversion, set the ADCR.TRGS[2:0] bits to 000b to select the software trigger as the trigger to start A/D conversion,
and then set the ADST bit in ADCSR to 0 (to stop A/D conversion).
23.6.3
Notes on Restarting A/D Conversion
Stopping analog input to the A/D converter by clearing the ADST bit in ADCSR to 0, requires one cycle of the ADCLK.
If A/D conversion is to be restarted right after the ADST bit was set to 0, set the ADST bit to 1 allow A/D conversion to
restart after one clock cycle has elapsed.
23.6.4
Notes on Entering Power-Down States
When this LSI enters the module stop state or software standby mode with A/D conversion enabled, the analog power
supply current is the same as it is during A/D conversion. If the analog power supply current needs to be reduced in the
module stop state or software standby mode, disable A/D conversion. To do so, set the ADST bit in ADCSR to 0, and
allow time for disabling of the analog input to the A/D converter.
Follow the procedure given below to ensure that this time is secured.
(1) Set the ADCR.TRGS[2:0] bits to 000b (software trigger).
(2) Clear the ADCSR.ADST bit to 0.
(3) Set the ADCR.CKS[1:0] bits to 11b (PCLK).
(4) After confirming that the A/D converter has been disabled, place the LSI in the module stop state or software
standby mode.
Summary of Contents for RX600 Series
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