QADC64E Enhanced Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
14-7
shows the total number of analog input channels supported with zero to four external
multiplexer chips using one QADC module.
NOTE: QADC64E External MUX Users
If a QADC64E module is in external multiplexing (EMUX) mode then the
multiplexer address signal channels AN[52:54] should
not
be programmed
into queues.
14.3
Programming the QADC64E Registers
The QADC64E has three global registers for configuring module operation.
•
The module configuration register, QADCMCR (
Section 14.3.1, “QADC64E Module
”)
•
The interrupt register, QADCINT (
Section 14.3.2, “QADC64E Interrupt Register
”)
•
The test register, QADCTEST. This register is used for factory test only.
These global registers are always defined to be in supervisor-only data space. Refer to
for the
QADC64E_A Address Map and
for QADC64E_B Address Map. See
“Supervisor/Unrestricted Address Space
” for access modes for these registers.
The remaining five registers in the control register block control the operation of the queuing mechanism,
and provide a means of monitoring the operation of the QADC64E.
•
Control register 0 (QACR0) contains hardware configuration information (
”)
•
Control register 1 (QACR1) is associated with queue 1 (
Section 14.3.6, “Control Register 1
”)
•
Control register 2 (QACR2) is associated with queue 2 (
Section 14.3.7, “Control Register 2
”)
•
Status registers (QASR0 and QASR1) provide visibility on the status of each queue and the
particular conversion that is in progress (
Section 14.3.8, “Status Registers (QASR0 and QASR1)
”)
The Conversion Command Word (CCW) table contains 64 entries to hold the software programmable
analog conversion sequences. Each CCW table entry is a 16-bit entry, though only 10 bits are used.
The final block of address space belongs to the result word table, which appears in three places in the
memory map. Each result word table location holds one 10-bit conversion value.
Table 14-4. Analog Input Channels
Number of Analog Input Channels Available
Directly Con External Multiplexed = Total Channels
No External
MUX Chips
One External
MUX Chip
Two External
MUX Chips
Three External
MUX Chips
Four External
MUX Chips
16
20
27
34
41
Summary of Contents for MPC561
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Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
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Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
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