MC68F375BGMZP33 Freescale Semiconductor, MC68F375BGMZP33 Datasheet - Page 483

• Manufacturer Part Number: MC68F375BGMZP33
• Description: IC MPU 32BIT 33MHZ 217-PBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68F375BGMZP33

• Processor Type: M683xx 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 217-PBGA
• Processor Series: M683xx
• Core: CPU32
• Data Bus Width: 32 bit
• Program Memory Type: Flash
• Program Memory Size: 256 KB
• Data Ram Size: 10 KB
• Interface Type: SPI, SCI, CAN
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 48
• Number Of Timers: 16
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 16 Channel
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Lead Free Status / Rohs Status: No

13.11.3 CTM9 Input Double Edge Period Measurement
MC68F375
REFERENCE MANUAL
Prescaler
Select
seconds can be measured. Note that a software option is provided to also generate an
interrupt after the first edge.
In the example shown in
for a DASM configured in the input pulse width measurement mode. When the leading
edge (programmed for either rising or falling edge) of the input signal occurs, the state
of the time-base bus is saved in register B1. When the trailing edge occurs, the time-
base bus is latched into register A, and the content of register B1 is transferred to reg-
ister B2. This operation leaves register B1 free for the next leading edge to occur, as
soon as 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 at any time read registers A and
B2 coherently (using a 32-bit read instruction) to get the latest edge measurements.
Since the measurement resolution is 16 bits, signals with pulse duty cycles from
0.0015% to 99.9985% can be measured. 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.
Two samples are also available to the software from a double-action submodule for
period measurement. The software can read the previous and the current edge sam-
ples and subtract them. As with pulse width measurement, the software can be sure
Clock
or Pin
From
Figure 13-16 CTM9 Example — Double Capture Pulse Width Measurement
Modulus Counter Submodule
Free-Running or
16-Bit Up Counter
Freescale Semiconductor, Inc.
For More Information On This Product,
CONFIGURABLE TIMER MODULE (CTM9)
Figure
Select
Bus
Submodule Bus
Go to: www.freescale.com
13-16, a counter submodule is used as the time-base
Buses
16-Bit
Time-
Base
Rev. 25 June 03
Two
Select
Bus
16-Bit Register A
16-Bit Register B1
16-Bit Register B2
Double Action Submodule
Interrupt
Capture
Trailing
Detect
Edge
Input
Edge
on
MOTOROLA
Input
Pin
13-57