S912XET256J2MAL Datasheet, PDF (525/1324 Pages) Freescale Semiconductor, Inc – MC9S12XEP100 Reference Manual Covers MC9S12XE Family

Chapter 13 Analog-to-Digital Converter (ADC12B16CV1)
13.4.2.2 General-Purpose Digital Port Operation
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
ADC12B16C. 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.
13.5 Resets
At reset the ADC12B16C is in a power down state. The reset state of each individual bit is listed within
the Register Description section (see Section 13.3.2, “Register Descriptions”) which details the registers
and their bit-field.
13.6 Interrupts
The interrupts requested by the ADC12B16C are listed in Table 13-24. Refer to MCU specification for
related vector address and priority.
Table 13-24. ATD Interrupt Vectors
Interrupt Source
Sequence Complete Interrupt
Compare Interrupt
CCR
Mask
I bit
I bit
Local Enable
ASCIE in ATDCTL2
ACMPIE in ATDCTL2
See Section 13.3.2, “Register Descriptions” for further details.
MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor
525