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CHAPTER 10 TIME-BASE TIMER
10.1
Overview of the Time-base Timer
The time-base timer is an 18-bit free-run counter (time-base counter) that counts up in
synchronization with the internal count clock (one-half of the source oscillation). The
timer has an interval timer function that can select four intervals.
The time-base timer also has functions for timer output of the oscillation stabilization
time and for supplying the clocks for the watchdog timer.
■
Interval Timer Function
The interval timer function repeatedly generates an interrupt request at a given interval.
•
An interrupt request is generated when the interval timer bit for the time-base counter overflows.
•
The interval timer bit (interval) can be selected from four types. Table 10.1-1 lists the intervals for the
time-base timer.
Table 10.1-1 Intervals for the Time-base Timer
Internal count clock cycle
Interval cycle
2 / HCLK (0.5 µs)
2
12
/ HCLK (Approx. 1.0 ms)
2
14
/ HCLK (Approx. 4.1 ms)
2
16
/ HCLK (Approx. 16.4 ms)
2
19
/ HCLK (Approx. 131.1 ms)
HCLK: Oscillation clock
Values in parentheses are for a 4 MHz oscillation clock.
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......