Motorola MCF5281 사용자 설명서
27-64
MCF5282 User’s Manual
MOTOROLA
Signal Connection Considerations
never transfer a full-scale value. If V
RL
is less than V
SSA
, the sample amplifier can never
transfer a 0 value.
Figure 27-45 shows the results of reference voltages outside the range defined by V
DDA
and V
SSA
. At the top of the input signal range, V
DDA
is 10 mV lower than V
RH
. This results
in a maximum obtainable 10-bit conversion value 0x03fe. At the bottom of the signal range,
V
V
SSA
is 15 mV higher than V
RL
, resulting in a minimum obtainable 10-bit conversion value
of 0x0003.
Figure 27-45. Errors Resulting from Clipping
27.9.3 Conversion Timing Schemes
This section contains some conversion timing examples. Figure 27-46 shows the timing for
basic conversions where it is assumed that:
basic conversions where it is assumed that:
• Q1 begins with CCW0 and ends with CCW3.
• CCW0 has pause bit set.
• CCW1 does not have pause bit set.
• External trigger rising edge for Q1
• CCW4 = BQ2 and Q2 is disabled.
• Q1 RES shows relative result register updates.
• CCW0 has pause bit set.
• CCW1 does not have pause bit set.
• External trigger rising edge for Q1
• CCW4 = BQ2 and Q2 is disabled.
• Q1 RES shows relative result register updates.
0
.020
5.100
5.110
1
2
3
4
5
6
7
8
3FA
3FB
3FC
3FD
3FE
3FF
.010
.030
5.120
5.130
10-bit
Result
(He
xadecimal)
Inputs in Volts (V
RH
= 5.120 V, V
RL
= 0 V)