Toshiba – Toshiba TMP87CP24AF User Manual
Page 108
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TOSHIBA
TMP87CM24A/P24A
(2) Reading of AD conversion result
After the end of conversion, read the conversion result from the ADCDR.
The
EOCF
is
automatically
cleared
to
"0"
when
reading
the
ADCDR.
When
the
conversion
result
is
read out during AD conversion, the invalid value is read out.
(3) AD conversion in STOP mode
When
the
MCU
places
in
the
STOP
mode
during
the
AD
conversion,
the
conversion
is
terminated
and
the
ADCDR
contents
become
indefinite.
Thus
EOCF
is
maintained
to
"0"
after
returned
from
the STOP mode.
However,
if
the
STOP
mode
is
started
after
the
end
of
conversion
(EOCF
=
1),
the
ADCDR
contents
are held.
ADS
ADCDR i
( Invalid )
[ Result ]
(Invalid)
[ Invalid )
J Result
'Conversion time ^
184/fc[s]
'Conversion time^
184/fc[s]
EOCF 1
-----
0—0
-------------------------------------------------- o------o------------ o-----------------------------
"O +J -Q +J +J
(p ro (P fO fO
0^ +-» 0^ +-» +-»
Figure 2-60. AD Conversion Timing Chart
Example:
After AIN pin 4 is selected as an analog input channel, AD conversion is started. EOCF
is confirmed and the converted result is read out. It is saved to address 009E
h
in RAM.
; AIN SELECT
LD
(ADCCR), 00100100B
; selectsAIN4
; AD CONVERT START
SET
(ADCCR). 6
; ADS = 1
SLOOP TEST
(ADCCR). 7
; EOCF = 1 ?
JRS
T, SLOOP
; RESULT DATA READ
LD
(9EH), (ADCDR)
3
-
24-108
2002
-
10-03