MC68HC812A4 Datasheet, PDF (294/342 Pages) Motorola, Inc – 16-bit device composed of standard on-chip peripheral modules connected by an intermodule bus. Modules include

Analog-to-Digital Converter (ATD)
Table 16-1. ATD Response to Background Debug Enable
FRZ1:FRZ0
ATD Response
00
Continue conversions in active background mode
01
Reserved
10
Finish current conversion, then freeze
11
Freeze when BDM is active
16.7.5 ATD Control Register 4
Address: $0064
Bit 7
6
5
4
3
2
1
Bit 0
Read: 0
Write:
SMP1 SMP0 PRS4 PRS3 PRS2 PRS1 PRS0
Reset: 0
0
0
0
0
0
0
1
= Unimplemented
Figure 16-7. ATD Control Register 4 (ATDCTL4)
SMP1 and SMP0 — Sample Time Select Bits
These bits select one of four sample times after the buffered sample
and transfer has occurred. Total conversion time depends on initial
sample time (two ATD clocks), transfer time (four ATD clocks), final
sample time (programmable, refer to Table 16-2), and resolution time
(10 ATD clocks).
Table 16-2. Final Sample Time Selection
SMP[1:0]
00
01
10
11
Final Sample Time
2 ATD clock periods
4 ATD clock periods
8 ATD clock periods
16 ATD clock periods
Total 8-Bit Conversion Time
18 ATD clock periods
20 ATD clock periods
24 ATD clock periods
32 ATD clock periods
MC68HC812A4 — Rev. 3.0
294
Analog-to-Digital Converter (ATD)
Advance Information
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