S912XEQ384J3MALR Freescale Semiconductor, S912XEQ384J3MALR Datasheet - Page 504

Manufacturer Part Number

S912XEQ384J3MALR

S912XEQ Series 16 Bit 50 Mhz 384 KB Flash 24 KB Ram Microcontroller - LQFP-112

Manufacturer

Freescale Semiconductor

Chapter 13 Analog-to-Digital Converter (ADC12B16CV1)

There is software programmable selection between performing single or continuous conversion on a

single channel or multiple channels.

— ICLKSTP=0 (in ATDCTL2 register)

— ICLKSTP=1 (in ATDCTL2 register)

ADC12B16C behaves same in Run and Wait Mode. For reduced power consumption continuos

conversions should be aborted before entering Wait mode.

In Freeze Mode the ADC12B16C will either continue or ﬁnish or stop converting according to the

FRZ1 and FRZ0 bits. This is useful for debugging and emulation.

Entering Stop Mode aborts any conversion sequence in progress and if a sequence was aborted

restarts it after exiting stop mode. This has the same effect/consequences as starting a

conversion sequence with write to ATDCTL5. So after exiting from stop mode with a

previously aborted sequence all ﬂags are cleared etc.

A/D conversion sequence seamless continues in Stop Mode based on the internally generated

clock ICLK as ATD clock. For conversions during transition from Run to Stop Mode or vice

versa the result is not written to the results register, no CCF ﬂag is set and no compare is done.

When converting in Stop Mode (ICLKSTP=1) an ATD Stop Recovery time

required to switch back to bus clock based ATDCLK when leaving Stop Mode. Do not access

ATD registers during

Modes of Operation

Conversion Modes

MCU Operating Modes

MC9S12XE-Family Reference Manual Rev. 1.24

Freescale Semiconductor