QADC64E Legacy Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
13-2
Freescale Semiconductor
13.2
Key Features and Quick Reference Diagrams
This section gives an overview of the implementation of the two QADC64E modules on
MPC561/MPC563. It can also be used as a quick reference guide while programming the modules.
13.2.1
Features of the QADC64E Legacy Mode Operation
•
Internal sample and hold
•
Directly supports up to four external multiplexers (for example the MC14051)
•
Up to 41 analog input channels using QADC64E external multiplexing
•
Programmable input sample time for various source impedances
•
Minimum conversion time of 7 µs (with typical QCLK frequency, 2 MHz)
•
Two conversion command queues with a total of 64 entries
•
Sub-queues possible using pause mechanism
•
Queue complete and pause software interrupts available on both queues
•
Queue pointers indicate current location for each queue
•
Automated queue modes initiated by
— External edge trigger
— Periodic/Interval timer, within QADC64E module
— Software command
— External gated trigger (Queue 1 only)
•
Single-scan or continuous-scan of queues
•
64 result registers in each QADC64E module
•
Output readable in three formats
— Right-justified unsigned
— Left-justified signed
— Left-justified unsigned
•
Unused analog channels on Port A can be used as digital input/output signals, unused analog
channels on Port B can be used as digital input signals.
The analog section includes input signals, an analog multiplexer, and the sample and hold circuits. The
analog conversion is performed by the digital-to-analog converter (DAC) resistor-capacitor array and a
high-gain comparator.
The digital control section contains queue control logic to sequence the conversion process and interrupt
generation logic. Also included are the periodic/interval timer, control and status registers, the conversion
command word (CCW) table RAM, and the result table RAM.
The bus interface unit (BIU) allows the QADC64E to operate with the applications software through the
IMB3 environment.
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
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...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...