ST92P141K4D0 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST92P141K4D0 Datasheet PDF : 179 Pages
| |||
ST92141 - ANALOG TO DIGITAL CONVERTER (ADC)
REGISTER DESCRIPTION (Cont’d)
CONTROL LOGIC REGISTER (CLR)
The Control Logic Register (CLR) manages the
ADC’s logic. Writing to this register will cause the
current conversion to be aborted and the autoscan
logic to be re-initialized. CLR is programmable as
follows:
CONTROL LOGIC REGISTER (CLR)
R253 - Read/Write
Register Page: 63
Reset Value: 0000 0000 (00h)
7
0
SC2 SC1 SC0 EXTG INTG POW CONT ST
Bit 7:5 = SC[2:0]: Start Conversion Address.
These 3 bits define the starting analog input chan-
nel (Autoscan mode). The first channel addressed
by SC[2:0] is converted, then the channel number
is incremented for the successive conversion, until
channel 7 (111) is converted. When SC2, SC1 and
SC0 are all set, only channel 7 will be converted.
Bit 4 = EXTG: External Trigger Enable.
This bit is set and cleared by software.
0: External trigger disabled.
1: External trigger enabled. Allows a conversion
sequence to be started on the subsequent edge
of the external signal applied to the EXTRG pin
(when enabled as an Alternate Function).
Bit 3 = INTG: Internal Trigger Enable.
This bit is set and cleared by software.
0: Internal trigger disabled.
1: Internal trigger enabled. Allows a conversion se-
quence to be started, synchronized by an inter-
nal signal (On-chip Event signal) from a Multi-
function Timer peripheral.
Both External and Internal Trigger inputs are inter-
nally ORed, thus avoiding Hardware conflicts;
however, the correct procedure is to enable only
one alternate synchronization input at a time.
Note: The effect of either synchronization mode is
to set the START/STOP bit, which is reset by hard-
ware when in SINGLE mode, at the end of each
sequence of conversions.
Requirements: The External Synchronisation In-
put must receive a low level pulse wider than an
INTCLK period and, for both External and On-Chip
Event synchronisation, the repetition period must
be greater than the time required for the selected
sequence of conversions.
Bit 2 = POW: Power Up/Power Down.
This bit is set and cleared by software.
0: Power down mode: all power-consuming logic is
disabled, thus selecting a low power idle mode.
1: Power up mode: the A/D converter logic and an-
alog circuitry is enabled.
Bit 1 = CONT: Continuous/Single.
0: Single Mode: a single sequence of conversions
is initiated whenever an external (or internal)
trigger occurs, or when the ST bit is set by soft-
ware.
1: Continuous Mode: the first sequence of conver-
sions is started, either by software (by setting
the ST bit), or by hardware (on an internal or ex-
ternal trigger, depending on the setting of the
INTG and EXTG bits); a continuous conversion
sequence is then initiated.
Bit 0 = ST: Start/Stop.
0: Stop conversion. When the A/D converter is
running in Single Mode, this bit is hardware re-
set at the end of a sequence of conversions.
1: Start a sequence of conversions.
154/179
9
Share Link: 