Datasheet

Chapter 8 Analog-to-Digital Converter (ATD10B8C) Block Description
240 MC9S12C-Family / MC9S12GC-Family Freescale Semiconductor
Rev 01.24
8.3.2.9 ATD Test Register 1 (ATDTEST1)
This register contains the SC bit used to enable special channel conversions.
Read: Anytime, returns unpredictable values for Bit 7 and Bit 6
Write: Anytime
Module Base + 0x0009
76543210
RUUUUUUU
SC
W
Reset 0 0 0 00000
= Unimplemented or Reserved
Figure 8-11. ATD Test Register 1 (ATDTEST1)
Table 8-14. ATDTEST1 Field Descriptions
Field Description
0
SC
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 Analog Input Channel
1 0 X X Reserved
1100 V
RH
1101 V
RL
1110 (V
RH
+V
RL
) / 2
1 1 1 1 Reserved