C505_9708 SIEMENS [Siemens Semiconductor Group], C505_9708 Datasheet - Page 170

• Manufacturer Part Number: C505_9708
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Depending on the oscillator frequency of the C505 and the selected divider ratio of the conversion
clock prescaler the total time of an A/D conversion is calculated according figure 6-44 and
table 6-8. Figure 6-46 shows the minimum A/D conversion time in relation to the oscillator
frequency f
with a prescalar ratio of 8 (or whenever f
Table 6-8
A/D Conversion Time for Dedicated System Clock Rates
f
2 MHz
5 MHz
6 MHz
10 MHz
12 MHz
16 MHz
20 MHz
Note : The prescaler ratios in table 6-8 are minimum values.
Figure 6-46
Minimum A/D Conversion Time in Relation to System Clock
Semiconductor Group
OSC
t
[MHz]
ADCC
30
25
20
15
10
OSC
s
5
0
0
. The minimum conversion time is 8 s and can be achieved at f
Prescaler
Ratio PS
2
4
4
8
8
16
16
16
4
4
6
f
.5
1.25
0.75
1.25
0.75
1
1.25
ADC
ADC
8
[MHz]
8
= 1.25 MHz).
6-108
10
On-Chip Peripheral Components
Sample Time
t
4
1.6
2.67
1.6
2.67
2
1.6
S
12
[ s]
14
t
16
ADCC min
16
Total Conversion
Time t
20
8
13.33
8
13.33
10
8
OSC
= 8 s
C505 / C505C
f
18
ADCC
OSC
MCT03302
of 10 MHz and
MHz
1997-08-01
[ s]
20