MC9S12XDP512CFU
Model | MC9S12XDP512CFU |
Description | 16-BIT, FLASH, 40MHz, MICROCONTROLLER, PQFP80 |
PDF file | Total 1348 pages (File size: 8M) |
Chip Manufacturer | PHILIPS |
Chapter 5 Analog-to-Digital Converter (S12ATD10B8CV2)
5.3.2.8
R
W
Reset
Reserved Register (ATDTEST0)
7
6
5
4
3
2
1
0
U
1
U
0
U
0
U
0
U
0
U
0
U
0
U
0
= Unimplemented or Reserved
Figure 5-10. Reserved Register (ATDTEST0)
Read: Anytime, returns unpredictable values
Write: Anytime in special modes, unimplemented in normal modes
NOTE
Writing to this register when in special modes can alter functionality.
5.3.2.9
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
W
Reset
U
0
U
0
0
0
0
0
0
0
0
0
0
0
SC
0
= Unimplemented or Reserved
Figure 5-11. ATD Test Register 1 (ATDTEST1)
Read: Anytime, returns unpredictable values for Bit7 and Bit6
Write: Anytime
Table 5-18. 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 5-19
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 5-19. Special Channel Select Coding
SC
1
1
1
1
1
CC
0
1
1
1
1
CB
X
0
0
1
1
CA
X
0
1
0
1
Analog Input Channel
Reserved
V
RH
V
RL
(V
RH
+V
RL
) / 2
Reserved
MC9S12XDP512 Data Sheet, Rev. 2.21
176
Freescale Semiconductor