MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 575

• 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

MPC555
USER’S MANUAL
Prescaler
Select
MIOS Modulus Counter Submodule
Clock
In the example shown in
for a MDASM configured in the input pulse width measurement mode. When the lead-
ing edge (programmed for being either rising or falling) of the input signal occurs, the
state of the 16-bit counter bus is saved in register B1. When the trailing edge occurs,
the 16-bit counter bus is latched into register A and the content of register B1 is trans-
ferred to register B2. This operation leaves register B1 free for the next leading edge
to occur on the next clock cycle. When enabled, an interrupt is provided after the trail-
ing edge, to notify the software that pulse width measurement data is available for a
new pulse. After the trailing edge, the software has one cycle time of the input signal
to obtain the values for each edge. When software attention is not needed for every
pulse, the interrupt can be disabled. The software can read registers A and B2 coher-
ently (using a 32-bit read instruction) at any time, to get the latest edge measurements.
The software work is less than half that needed with a timer that requires the software
to read one edge and save the value and then wait for the second edge.
or Pin
From
Figure 15-9 MIOS1 Example: Double Capture Pulse Width Measurement
/
MPC556
16-bit Up-Counter
MODULAR INPUT/OUTPUT SUBSYSTEM (MIOS1)
Figure
Submodule Bus
Rev. 15 October 2000
Counter
15-9, a counter submodule is used as the time-base
Buses
16-bit
Two
Select
Bus
in IPWM mode (MOD3-MOD0 = 0b0001)
16-bit Register B1
16-bit Register B2
16-bit Register A
MIOS Double Action Submodule
Interrupt
Capture
Trailing
Detect
Edge
Input
Edge
on
MOTOROLA
Input
Pin
15-39