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型號(hào)：	MC68F375MZP33R2
廠商：	Freescale Semiconductor
文件頁(yè)數(shù)：	427/616頁(yè)
文件大?。?/td>	0K
描述：	IC MPU 32BIT 33MHZ 217-PBGA
標(biāo)準(zhǔn)包裝：	500
系列：	M683xx
處理器類型：	M683xx 32-位
速度：	33MHz
電壓：	5V
安裝類型：	表面貼裝
封裝/外殼：	217-BBGA
供應(yīng)商設(shè)備封裝：	217-PBGA（23x23）
包裝：	帶卷 (TR)

CONFIGURABLE TIMER MODULE (CTM9)

REFERENCE MANUAL

Rev. 25 June 03

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 Figure 13-16, a counter submodule is used as the time-base

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.

Figure 13-16 CTM9 Example — Double Capture Pulse Width Measurement

13.11.3 CTM9 Input Double Edge Period Measurement

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

16-Bit Up Counter

Submodule Bus

16-Bit Register B1

16-Bit Register B2

16-Bit Register A

Double Action Submodule

Modulus Counter Submodule

Free-Running or

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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