PXS20RM Datasheet, PDF (164/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Analog-to-Digital Converter (ADC)
Table 9-3. MCR field descriptions (continued)
Field
Description
REF_RANGE_EXP This is a control bit programmed by the user, which specifies the expected value of
MSR[REF_RANGE].
If the expected value does not match with the actual value, an ISR bit is set.
CTUEN
Cross Trigger Unit Enable
0 The cross triggering unit is disabled and the triggered injected conversion cannot occur.
1 The cross triggering unit is enabled and the triggered injected conversion can occur.
STCL
Self Testing Configuration Lock
0 No lock
1 The self-testing configuration is locked i.e. STCR1, STCR2, STCR3, STBRR, STAW0R,
STAW1AR, STAW1BR, STAW2R, STAW3R, STAW4R, STAW5R are write-protected. It
can be used only in CPU and SCAN mode. The lock bit is cleared only by a peripheral
reset.
ADCLKSEL
Analog clock frequency selector
If this bit is set the AD_clk frequency is equal to the system clock frequency. Otherwise, it is
half of the system clock frequency. This bit can be written in power-down mode only.
ABORTCHAIN
Abort Chain
When this bit is set, the ongoing chain conversion is aborted. This bit is cleared by hardware
as soon as a new conversion is requested.
0 Conversion is not affected.
1 Aborts the ongoing chain conversion.
ABORT
Abort Conversion
When this bit is set, the ongoing conversion is aborted and a new conversion is invoked. This
bit is cleared by hardware as soon as a new conversion is invoked.
0 Conversion is not affected.
1 Aborts the ongoing conversion.
ACKO
Auto-clock-off enable
If set, this bit enables the Auto clock off feature.
0 Auto clock off is disabled.
1 Auto clock off is enabled.
PWDN
Power-down enable
When this bit is set, the analog module is requested to enter Power Down mode. When ADC
status is PWDN, clearing this bit starts ADC transition to idle mode.
0 ADC is in normal mode.
1 ADC has been requested to power down.
9.3.2.2 Main Status Register (MSR)
The Main Status Register (MSR) provides status bits for the ADC.
PXS20 Microcontroller Reference Manual, Rev. 1
9-6
Freescale Semiconductor