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Chapter 28 Analog-to-Digital Converter (ADC)
MPC5606BK Microcontroller Reference Manual, Rev. 2
726
Freescale Semiconductor
Presampling can be enabled/disabled on a channel basis by setting the corresponding bits in the PSR
registers.
After enabling the presampling for a channel, the normal sequence of operation will be
Presa Sa Conversion for that channel. Sampling of the channel can be bypassed by
setting the PRECONV bit in the PSCR. When sampling of a channel is bypassed, the sampled data of
internal voltage in the presampling state is converted (
Figure 28-6. Presampling sequence
Figure 28-7. Presampling sequence with PRECONV = 1
28.3.5.2
Presampling channel enable signals
It is possible to select between two internally generated voltages V0 and V1 depending on the value of the
PSCR[PREVAL] as shown in
Three presampling value fields, one per channel type, in the PSCR make it possible to select different
presampling values for each type.
28.3.6
Programmable analog watchdog
28.3.6.1
Introduction
The analog watchdogs are used for determining whether the result of a channel conversion lies within a
given guarded area (as shown in
) specified by upper and lower threshold values named THRH
and THRL, respectively.
Table 28-7. Presampling voltage selection based on PREVAL
x
fields
PSCR[PREVAL
x
]
Presampling voltage
00
V0 = V
SS_HV_ADC0
or V
SS_HV_ADC1
01
V1 = V
DD_HV_ADC0
or V
DD_HV_ADC1
10
Reserved
11
Reserved
Presampling is enabled in the channel C and D. For channel B total conversion clock cycles = (S) + (C).
For channel C and D total conversion clock cycles = (P) + (S) + (C).
Sample B
Convert B
Presample C
Convert C
Presample D
Sample D
Convert D
Sample C
Sample E
Sample B
Convert B
Presample C
Presample D
Convert D
Sample E
Convert E
Convert C
Presampling enabled in channel C and D but sampling is bypassed in these channels by setting PRECONV = 1 in the PSCR.
For channel C and D total conversion clock cycles = (P) + (C).
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