PXS20RM Datasheet, PDF (174/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Analog-to-Digital Converter (ADC)
Table 9-17. CTR0 field descriptions (continued)
Field
Description
OFFSHIFT Configuration for offset shift characteristic
00 No shift (that is the transition between codes 000h and 001h) is reached when the A_VIN (analog input
voltage) is equal to 1 LSB.
01 Transition between code 000h and 001h is reached when the A_VIN is equal to1/2 LSB
10 Transition between code 00h and 001h is reached when the A_VIN is equal to 0
11 Not used
INPCMP Configuration bits for comparison phase duration (see Table 9-18)
INPSAMP Configuration bits for sampling phase duration (see Figure 9-15)
INPCMP
=1
Tbiteval
=10b
Tbiteval
=11b
Tbiteval
=00b
Tbiteval
AD_ck
INPLATCH=0
INPLATCH=1
1/2Tck
1/2Tck*
1/2 Tck
1 Tck
1 Tck
1.5 Tck
1 Tck
2 Tck
Figure 9-15. Conversion timing
*internally forced
Table 9-18. Minimum AD_ck frequency
INPCMP
01
10
11
00
AD_ck min. freq (MHz)
3
6
9
12
9.3.10.2 Conversion Timing Register 1 (CTR1)
This register configures the conversion timings for channel 15 (the TSENS channel).
9-16
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor