QADC64E Legacy Mode Operation
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
13-67
Port A signals are configured as inputs or outputs by programming the port data direction register,
DDRQA. The digital input signal states are read from the port data register, PORTQA, when the port data
direction register specifies that the signals are inputs. The digital data in the port data register is driven onto
the port A signals when the corresponding bit in the port data direction register specifies that the signals
are outputs. Refer to
Appendix B, “Internal Memory Map
,” for more information. Since the outputs are
configured as push-pull drivers, external pull-up provisions are not necessary when the output is used to
drive another integrated circuit.
13.7.2
External Trigger Input Signals
The QADC64E uses two external trigger signals (ETRIG[2:1]). Each of the two input external trigger
signals is associated with one of the scan queues, queue 1 or queue 2 The assignment of ETRIG[2:1] to a
queue is made in the QACR0 register by the TRG bit. When TRG=0, ETRIG[1] triggers queue 1 and
ETRIG[2] triggers queue 2. When TRG=1, ETRIG[1] triggers queue 2 and ETRIG[2] triggers queue 1.
NOTE
The ETRIG[2:1] pins on the MPC561/MPC563 are multiplexed with the
PCS[7:6] pins.
13.7.3
Analog Power Signals
V
DDA
and V
SSA
signals supply power to the analog subsystems of the QADC64E module. Dedicated
power is required to isolate the sensitive analog circuitry from the normal levels of noise present on the
digital power supply. Refer to
Appendix F, “Electrical Characteristics
,” for more information.
The analog supply signals (V
DDA
and V
SSA
) define the limits of the analog reference voltages (V
RH
and
V
RL
) and of the analog multiplexer inputs.
is a diagram of the analog input circuitry.
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...