MC68F375BGMZP33 Freescale Semiconductor, MC68F375BGMZP33 Datasheet - Page 482

• 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

13.11.2 CTM9 Input Double Edge Pulse Width Measurement
MC68F375
REFERENCE MANUAL
software also selects one of two time-base buses, each originating at a counter sub-
module. The software can also enable an interrupt to occur when the input edge is
detected to notify the software that new edge capture information is available.
Figure 13-15
figured for input capturing. To measure the period of an incoming signal, the software
reads and saves the latched value in register A for one edge, then when the next edge
arrives, the software subtracts the new captured value in register A from the previously
saved value to obtain the period interval. The maximum period that can be measured
is the worst case software response time to a newly captured value.
The software measures the width of a pulse in a very similar way, the only difference
is that after each edge, the edge detector is reprogrammed to trigger on the next oppo-
site edge.
To measure the width of an input pulse, the CTM9 double-action submodule (DASM)
has two capture registers so that only one interrupt is needed after the second edge.
The software can read both edge samples and subtract them to get the pulse width.
The leading edge sample is double latched so that the software has the time of one
full period of the input signal to read the samples to be sure that nothing is lost.
Depending on the prescaler divide ratio, pulses width from 0.119 microseconds to 3
Prescaler
Modulus
Select
Control
Clock
or Pin
From
Modulus Counter Submodule
Figure 13-15 CTM9 Example — Single Edge Input Capture
Free-Running or
Load
Modulus Register
shows an example of an MCSM a counter submodule for an SASM con-
16-Bit Up Counter
Freescale Semiconductor, Inc.
Overflow
For More Information On This Product,
CONFIGURABLE TIMER MODULE (CTM9)
Select
Bus
Go to: www.freescale.com
Rev. 25 June 03
Submodule Bus
Buses
16-Bit
Time-
Base
Two
Select
Bus
16-Bit Register A
Single Action Submodule Channel
Interrupt
Capture
Detect
Input
Edge
Input
MOTOROLA
Pin
13-56