sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 304

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

Analog-to-Digital Converter (ADC12B8CV1) Block Description
be edge or level sensitive with polarity control.
combinations of control bits and their effect on the external trigger function.
During a conversion, if additional active edges are detected the overrun error flag ETORF is set.
In either level or edge triggered modes, the first conversion begins when the trigger is received.
Once ETRIGE is enabled, conversions cannot be started by a write to ATDCTL5, but rather must be
triggered externally.
If the level mode is active and the external trigger both de-asserts and re-asserts itself during a conversion
sequence, this does not constitute an overrun. Therefore, the flag is not set. If the trigger is left asserted in
level mode while a sequence is completing, another sequence will be triggered immediately.
8.4.2.2
The input channel pins can be multiplexed between analog and digital data. As analog inputs, they are
multiplexed and sampled as analog channels to the A/D converter. The analog/digital multiplex operation
is performed in the input pads. The input pad is always connected to the analog input channels of the
ADC12B8C. The input pad signal is buffered to the digital port registers. This buffer can be turned on or
off with the ATDDIEN register. This is important so that the buffer does not draw excess current when
analog potentials are presented at its input.
8.5
At reset the ADC12B8C is in a power down state. The reset state of each individual bit is listed within the
Register Description section (see
their bit-field.
304
Resets
General-Purpose Digital Port Operation
ETRIGLE
X
X
0
0
1
1
ETRIGP
X
X
0
1
0
1
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Table 8-22. External Trigger Control Bits
Section 8.3.2, “Register
ETRIGE
0
0
1
1
1
1
Table 8-22
SCAN
X
X
X
X
0
1
Ignores external trigger. Performs one
conversion sequence and stops.
Ignores external trigger. Performs
continuous conversion sequences.
Falling edge triggered. Performs one
conversion sequence per trigger.
Rising edge triggered. Performs one
conversion sequence per trigger.
Trigger active low. Performs continuous
conversions while trigger is active.
Trigger active high. Performs continuous
conversions while trigger is active.
Descriptions”) which details the registers and
gives a brief description of the different
Description
Freescale Semiconductor