MC9S12E256 Datasheet, PDF (224/602 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Chapter 6 Analog-to-Digital Converter (ATD10B16CV4)
6.3.2.9 ATD Test Register 1 (ATDTEST1)
This register contains the SC bit used to enable special channel conversions.
7
6
5
4
3
2
1
0
R
u
u
u
u
u
u
u
SC
W
Reset
0
0
0
0
0
0
0
0
= Unimplemented or Reserved
u = Unaffected
Figure 6-11. Reserved Register 1 (ATDTEST1)
Read: Anytime, returns unpredictable values for bit 7 and bit 6
Write: Anytime
NOTE
Writing to this register when in special modes can alter functionality.
Table 6-19. ATDTEST1 Field Descriptions
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 6-20 lists the coding.
0 Special channel conversions disabled
1 Special channel conversions enabled
Table 6-20. Special Channel Select Coding
SC
CD
CC
CB
1
0
0
X
1
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
1
1
X
X
CA
Analog Input Channel
X
Reserved
0
V_RH
1
V_RL
0
(V_RH+V_RL) / 2
1
Reserved
X
Reserved
MC9S12E256 Data Sheet, Rev. 1.08
224
Freescale Semiconductor