MC9S12Q128_10 Datasheet, PDF (240/644 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 8 Analog-to-Digital Converter (ATD10B8C) Block Description
8.3.2.9 ATD Test Register 1 (ATDTEST1)
This register contains the SC bit used to enable special channel conversions.
Module Base + 0x0009
7
6
5
4
3
2
R
U
U
U
U
U
U
W
Reset
0
0
0
0
0
0
= Unimplemented or Reserved
Figure 8-11. ATD Test Register 1 (ATDTEST1)
Read: Anytime, returns unpredictable values for Bit 7 and Bit 6
Write: Anytime
Table 8-14. ATDTEST1 Field Descriptions
1
0
U
SC
0
0
Field
0
SC
Description
Special Channel Conversion Bit — If this bit is set, then special channel conversion can be selected using CC,
CB, and CA of ATDCTL5. Table 8-15 lists the coding.
0 Special channel conversions disabled
1 Special channel conversions enabled
Note: Always write remaining bits of ATDTEST1 (Bit7 to Bit1) zero when writing SC bit. Not doing so might result
in unpredictable ATD behavior.
Table 8-15. Special Channel Select Coding
SC CC CB CA
1
0
X
X
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
Analog Input Channel
Reserved
V_RH
V_RL
(V_RH+V_RL) / 2
Reserved
240
MC9S12Q128
Freescale Semiconductor
Rev 1.10