20. Oscillation Frequency Detector (OFD)
The oscillation frequency detector circuit (OFD) detects abnormal clock frequency. To use the OFD, abnormal
states of clock such as a harmonic, a sub harmonic or stopped state can be detected.
The OFD monitors the target clock frequency using reference frequency and generates a reset signal if abnor-
mal state is detected. And if the reference frequency stops, a reset signal is generated, too.
TMPM3V6/M3V4
uses internal high-speed oscillator clock as a reference and the target clock is an external
high-speed oscillator clock.
Note:
It is not guaranteed that OFD can detect all defects at any time, and it is not a circuit to measure error frequen-
cy.
20.1 Block diagram
IHOSC
Reference clock
intended detection clock
Oscillation Frequency Detection
circuit
OFD
Internal data bus
OFD Reset
OFDCR1
OFDCR2
OFDMN
OFDMX
OFDRST
OFDSTAT
f
IHOSC
f
EHOSC
EHOSC
X1
Figure 20-1 Oscillation Frequency Detector Block diagram
TMPM3V6/M3V4
Page 421
2019-02-06
Содержание TMPM3V4
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Страница 178: ...TMPM3V6 M3V4 9 Input Output port 9 2 Block Diagrams of Ports Page 156 2019 02 06 ...
Страница 206: ...TMPM3V6 M3V4 10 16 bit Timer Event Counters TMRB 10 7 Applications using the Capture Function Page 184 2019 02 06 ...
Страница 232: ...TMPM3V6 M3V4 11 Universal Asynchronous Receiver Transmitter Circuit UART 11 4 Operation Description Page 210 2019 02 06 ...
Страница 354: ...TMPM3V6 M3V4 14 Synchronous Serial Port SSP 14 6 Frame Format Page 332 2019 02 06 ...
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Страница 420: ...TMPM3V6 M3V4 16 Analog Digital Converter ADC 16 6 Timing chart of AD conversion Page 398 2019 02 06 ...
Страница 462: ...TMPM3V6 M3V4 21 Watchdog Timer WDT 21 5 Control register Page 440 2019 02 06 ...
Страница 510: ...TMPM3V6 M3V4 22 Flash Memory Operation 22 4 Programming in the User Boot Mode Page 488 2019 02 06 ...
Страница 538: ...TMPM3V6 M3V4 25 Electrical Characteristics 25 7 Recommended Oscillation Circuit Page 516 2019 02 06 ...
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