MC68HC05JJ6 Datasheet, PDF (121/216 Pages) Freescale Semiconductor, Inc – General Release Specification Microcontrollers

Analog Subsystem
Shorter discharge times may be used if lesser accuracy in the voltage
measurement is acceptable.
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 the following figures
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
MC68HC05JJ6/MC68HC05JP6 — Rev. 3.2
Freescale Semiconductor
Analog Subsystem
General Release Specification
121