QADC64E Enhanced Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
14-32
Freescale Semiconductor
8
IST
Input Sample Time. The IST field allows software to specify the length of the sample
window. Provision is made to vary the input sample time, through software control, to offer
flexibility in the source impedance of the circuitry providing the QADC64E analog channel
inputs. Longer sample times permit more accurate A/D conversions of signals with higher
source impedances. The programmable sample time can also be used to increase the time
interval between conversions to adjust the queue execution time or the sampling rate.
0 QCLK period x 2
1 QCLK period x 8
9:15
CHAN[6:0]
Channel Number. The CHAN field selects the input channel number. The software
programs the channel field of the CCW with the 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 multiplexed or
non-multiplexed mode is used by the application. As far as the queue scanning operations
are concerned, there is no distinction between an internally or externally multiplexed
analog input. Refer to
Section 14.2.5, “External Multiplexing
” for more information on
external multiplexing.
and
show the channel number assignments
Table 14-20. QADC64E_A Multiplexed Channel Assignments and Signal Designations
Multiplexed Input Signals
Channel Number in CCW CHAN
Field
Port Signal
Name
Analog
Signal Name
Other Functions /
Descriptions
Signal Type
Binary
Decimal
ANw/A_PQB0
AN00 to AN07
—
Input
0000000 to
0000111
0 to 7
ANx/A_PQB1
AN08 to AN15
—
Input
0001000 to
0001111
8 to 15
ANy/A_PQB2
AN16 to AN23
—
Input
0010000 to
0010111
16 to 23
ANz/A_PQB3
AN24 to AN31
—
Input
0011000 to
0011111
24 to 31
—
RESERVED
—
—
0100000 to
0101001
32 to 41
—
RESERVED
—
—
0101010
42
—
RESERVED
—
—
0101011
43
A_PQB0
A_PQB1
A_PQB2
A_PQB3
AN44
AN45
AN46
AN47
ANw
ANx
ANy
ANz
Input/Output
Input/Output
Input/Output
Input/Output
0101100
0101101
0101110
0101111
44
45
46
47
A_PQB4
A_PQB5
A_PQB6
A_PQB7
AN48
AN47
AN50
AN51
—
—
—
—
Input/Output
Input/Output
Input/Output
Input/Output
0110000
0110001
0110010
0110011
48
49
50
51
Table 14-19. CCW Bit Descriptions (continued)
Bits
Name
Description
Summary of Contents for MPC561
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