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CHAPTER 18 8-/10-BIT A/D CONVERTER
bit12 PAUS:
Pause flag bit
This bit indicates the A/D conversion operating state when the EI
2
OS
function is used.
• The PAUS bit is enabled only when the EI
2
OS function is used.
• When next A/D conversion terminates before the A/D conversion
result completes the transfer from the A/D data register (ADCR0, 1)
to memory, the A/D conversion pauses in order to prevent previous
data from being overwritten. When the A/D conversion pauses, the
PAUS bit is set to "1".
• After transfer of the A/D conversion results to memory, the 8-/10-bit
A/D converter automatically resumes A/D conversion.
Note:
• See "18.5.5 A/D-converted Data Protection Function" for the
conversion data protection function.
• This bit is not cleared even if the pause state is cancelled. To clear
this bit, write "0" to it.
bit11,
bit10
STS1, STS0:
A/D conversion start
trigger select bits
These bits select the trigger to start the 8-/10-bit A/D converter.
•00
B
: Software start
•01
B
: External pin trigger or software start
•10
B
: Software start
•11
B
: External pin trigger or software start
Note:
• When the falling edge is detected in the ADTG pin at selected
external terminal trigger (01
B
, 11
B
), the A/D conversion is begun.
• If two or more start triggers are set (other than STS1, STS0="00
B
",
"10
B
"), the 8-/10-bit A/D converter is started by the first-generated
start trigger.
• Start trigger setting should be changed when the operation of
resource generating a start trigger is stopped (trigger is inactive).
bit9 STRT:
A/D conversion
software start bit
This bits starts the 8-/10-bit A/D converter by software.
When set to "1": Starts 8-/10-bit A/D converter
• If A/D conversion pauses in the pause-conversion mode, it is
resumed by writing 1 to the STRT bit.
When set to "0": Invalid. The state remains unchanged.
Note:
• The read-modify-write instructions read "0".
• The byte/word command reads "1".
• Do not perform forcible termination (BUSY = 0) and software
start (STRT = 1) of the 8-/10-bit A/D converter simultaneously.
bit8 Undefined bit • Read: "1" is always read.
• Write: No effect
Table 18.3-2 Function of Each Bit of A/D Control Status Register (High) (ADCS1) (2/2)
Bit name Function