MC68HC705JP7 Datasheet, PDF (125/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Analog Subsystem
A/D Conversion Methods
NOTE:
Sufficient time should be allowed to discharge the external capacitor or
subsequent charge times will be shortened with resultant errors in timing
conversion.
Table 8-4 gives the range of values of each parameter in the A/D timing
conversion and Table 8-5 gives some A/D conversion examples for
several bit resolutions.
The mode selection bits in the ACR allow four methods of single-slope
A/D conversion. Each of these methods is shown in Figure 8-8 through
Figure 8-11 using the signal names and parameters given in Table 8-4.
• Manual start and stop (mode 0) Figure 8-8
• Manual start and automatic discharge (mode 1) Figure 8-9
• Automatic start and stop from TOF to ICF (mode 2) Figure 8-10
• Automatic start and stop from OCF to ICF (mode 3) Figure 8-11
MC68HC705JJ7 • MC68HC705JP7 — REV 4
MOTOROLA
Analog Subsystem
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