QADC64E Legacy Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
13-31
8:9
IST
Input sample time. The IST field specifies the length of the sample window. Longer sample times
permit more accurate A/D conversions of signals with higher source impedances, especially if
BYP = 1.
00 QCKL period x 2
01 QCKL period x 4
10 QCKL period x 8
11 QCKL period x 16
10:15
CHAN
Channel number. The CHAN field selects the input channel number corresponding to the analog
input signal to be sampled and converted. The analog input signal channel number assignments
and the signal definitions vary depending on whether the QADC64E is operating in multiplexed
or non-multiplexed mode. The queue scan mechanism sees no distinction between an internally
or externally multiplexed analog input.
If CHAN specifies a reserved channel number (channels 32 to 47) or an invalid channel number
(channels 4 to 31 in non-multiplexed mode), the low reference level (VRL) is converted.
Programming the channel field to channel 63 indicates the end of the queue. Channels 60 to 62
are special internal channels. When one of these channels is selected, the sample amplifier is
not used. The value of VRL, VRH, or (V
RH
– V
RL
)/2 is placed directly into the converter.
Programming the input sample time to any value other than two for one of the internal channels
has no benefit except to lengthen the overall conversion time.
shows the channel number assignments for non-multiplexed mode.
shows the channel number assignments for multiplexed mode.
Table 13-19. Non-Multiplexed Channel Assignments and Signal Designations
Non-multiplexed Input Signals
Channel Number in CHAN
Port Signal
Name
Analog Signal
Name
Other Functions
Signal Type
(I/O)
Binary Decimal
PQB0
PQB1
PQB2
PQB3
AN0
AN1
AN2
AN3
—
—
—
—
I
I
I
I
000000
000001
000010
000011
0
1
2
3
—
—
PQB4
PQB5
—
—
AN48
AN49
Invalid
Reserved
—
—
—
—
I
I
000100 to 011111
10XXXX
110000
110001
4 to 31
32 to 47
48
49
Port Signal
Name
Analog Signal
Name
Other Functions
Signal Type
(I/O)
Binary Decimal
PQB6
PQB7
PQA0
PQA1
AN50
AN51
AN52
AN53
—
—
—
—
I
I
I/O
I/O
110010
110011
110100
110101
50
51
52
53
PQA2
PQA3
PQA4
PQA5
AN54
AN55
AN56
AN57
—
—
—
—
I/O
I/O
I/O
I/O
110110
110111
111000
111001
54
55
56
57
Table 13-18. CCW Bit Descriptions (continued)
Bits
Name
Description
Summary of Contents for MPC561
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