MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 417

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

13.3.5 Multiplexed Analog Input Pins
13.3.6 Voltage Reference Pins
13.3.7 Dedicated Analog Supply Pins
13.3.8 External Digital Supply Pin
13.3.9 Digital Supply Pins
MPC555
USER’S MANUAL
When externally-multiplexed mode is enabled, MA[2:0] are used as the address inputs
for up to four 1-of-8 multiplexer chips (for example, the MC14051 and the
MC74HC4051). Since MA[2:0] are digital outputs in multiplexed mode, the software
programmed input/output direction and data for these pins in DDQA[2:0], DDRQA, and
PQA[2:0] is ignored, and the value for MA[2:0] is taken from the currently executing
CCW.
In externally-multiplexed mode, four of the port B pins are redefined to each represent
a group of eight input channels. Refer to
The analog output of each external multiplexer chip is connected to one of the AN[w,
x, y, z] inputs in order to convert a channel selected by the MA[2:0] multiplexed ad-
dress outputs.
V
arating the reference inputs from the power supply pins allows for additional external
filtering, which increases reference voltage precision and stability, and subsequently
contributes to a higher degree of conversion accuracy.
V
Dedicated power is required to isolate the sensitive analog circuitry from the normal
levels of noise present on the digital power supply.
Each port A pin includes a digital output driver, an analog input signal path, and a dig-
ital input synchronizer. The V
A pins. V
V
digital MCU modules.
RH
DDA
DD
and V
and V
/
MPC556 QUEUED ANALOG-TO-DIGITAL CONVERTER MODULE-64
and V
DDH
RL
SS
SSA
are the dedicated input pins for the high and low reference voltages. Sep-
provide the power for the digital portions of the QADC64, and for all other
Multiplexed Analog Input
provides the supply level for the drivers on port A pins.
Table 13-1 Multiplexed Analog Input Channels
pins supply power to the analog subsystems of the QADC64 module.
ANw
ANx
ANy
ANz
SS
Rev. 15 October 2000
pin provides the ground level for the drivers on the port
Even-numbered channels from 16 to 30
Odd-numbered channels from 17 to 31
Even-numbered channels from 0 to 14
Odd-numbered channels from 1 to 15
Table
13-1.
Channels
MOTOROLA
13-5