16-7
MSM66591/ML66592 User's Manual
Chapter 16 A/D Converter Functions
16
16.2 Control Register of A/D Converter
[1]
A/D Control Register 0L (ADCON0L)
ADCON0L is a 7-bit register that primarily controls the scan mode of the A/D converter.
Figure 16-5 shows the configuration of ADCON0L.
At reset (when the
RES
signal is input, the BRK instruction is executed, the watchdog
timer is overflown, or an operation code trap is generated), ADCON0L becomes 80H.
<Description of Each Bit>
• ADSNM00–ADSNM03 (bit 0–bit 3)
These 4 bits specify the scan channel in scan mode.
Change the scan channel after setting ADRUN0 (bit 4) to "0". When ADRUN0 is "1"
(when A/D conversion is running in scan mode), changing the scan channel is invalid.
• ADRUN0 (bit 4)
This bit specifies RUN/STOP of A/D conversion in scan mode.
If this bit is "1", A/D conversion RUN is selected, and if "0", A/D conversion STOP is
selected. When A/D conversion STOP is selected by setting SCNC0 (bit 6) to "1" after
a scan cycle is completed, ADRUN0 does not automatically become "0", even if A/D
conversion stops after a scan cycle is completed.
• SNEX0 (bit 5)
This bit specifies the A/D conversion start factor in scan mode.
If this bit is "0", the next conversion starts when the A/D conversion is over. If this bit
is "1", 1 channel A/D conversion starts at each valid edge of the external interrupt
input pin (INT1). At this time, bit 1 of the Port 6 secondary function control register
must be set to to "1", and the INT1 pin must be set to the secondary function.
Operation examples 1, 2 and 3 when SNEX0 is set to "1" are shown below.
1. In the case of an initial start, ADRUN0 is set to "1", and at the same time the first
channel of the scan channel is A/D converted. Then the 2nd or later channels of the
scan channels are sequentially A/D converted, synchronizing with the valid edge of
INT1.
2. When A/D conversion is stopped after the completion of a scan channel cycle, if A/
D conversion is restarted by setting INTSN0 to "0" by the program, A/D conversion
starts from the first channel of the scan channels, synchronizing with the valid edge of
INT1.
3. In other cases, set ADRUN0 and SNEX0 to "0" simultaneously by the program, and
set ADRUN0 and SNEX0 simultaneously to "1" by the program again. In this case the
first channel of the scan channels is A/D converted as soon as ADRUN0 becomes
"1". After that, A/D conversion is performed in synchronization with the valid edge of
INT1.
Содержание MSM66591
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