MC9S08GT16ACBE Datasheet, PDF (227/300 Pages) Freescale Semiconductor, Inc – Microcontrollers

Analog-to-Digital Converter (S08ATDV3)
Table 14-3. Available Result Data Formats
RES8 DJM SGN
Data Formats of Result
Analog Input
V_REFH = V_DDA, V_REFL = V_SSA
ATDRH:ATDRL
V_DDA
1
0
0
8-bit : left justified : unsigned
$FF:$00
1
0
1
8-bit : left justified : signed
$7F:$00
1
1
X¹
8-bit : left justified² : unsigned
$FF:$00
0
0
0
10-bit : left justified : unsigned
$FF:$C0
0
0
1
10-bit : left justified : signed
$7F:$C0
0
1
X¹
10-bit : right justified : unsigned
$03:$FF
1 _{The SGN bit is only effective when DJM = 0. When DJM = 1, SGN is ignored.}
2 _{8-bit results are always in ATDRH.}
V_SSA
$00:$00
$80:$00
$00:$00
$00:$00
$80:$00
$00:$00
Table 14-4. Clock Prescaler Values
PRS
Factor = (PRS +1) × 2
Max Bus Clock
Max Bus Clock
Min Bus Clock³
MHz
MHz
MHz
(2 MHz max ATD Clock)¹ (1 MHz max ATD Clock)² (500 kHz min ATD Clock)
0000
2
4
2
1
0001
4
8
4
2
0010
6
12
6
3
0011
8
16
8
4
0100
10
20
10
5
0101
12
20
12
6
0110
14
20
14
7
0111
16
20
16
8
1000
18
20
18
9
1001
20
20
20
10
1010
22
20
20
11
1011
24
20
20
12
1100
26
20
20
13
1101
28
20
20
14
1110
30
20
20
15
1111
32
20
20
16
1 _{Maximum ATD conversion clock frequency is 2 MHz. The max bus clock frequency is computed from the max ATD conversion}
clock frequency times the indicated prescaler setting; i.e., for a PRS of 0, max bus clock = 2 (max ATD conversion clock
frequency) × 2 (Factor) = 4 MHz.
2 _{Use these settings if the maximum desired ATD conversion clock frequency is 1 MHz. The max bus clock frequency is}
computed from the max ATD conversion clock frequency times the indicated prescaler setting; i.e., for a PRS of 0, max bus
clock = 1 (max ATD conversion clock frequency) × 2 (Factor) = 2 MHz.
3 _{Minimum ATD conversion clock frequency is 500 kHz. The min bus clock frequency is computed from the min ATD conversion}
clock frequency times the indicated prescaler setting; i.e., for a PRS of 1, min bus clock = 0.5 (min ATD conversion clock
frequency) × 2 (Factor) = 1 MHz.
MC9S08GT16A/GT8A Data Sheet, Rev. 1
Freescale Semiconductor
227