Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 7 16-BIT TIMER/EVENT COUNTER AA (TAA)
R01UH0042EJ0500 Rev.5.00 Page 228 of 1513
Aug 12, 2011
(a) Function as compare register
The TAAnCCR0 register can be rewritten even when the TAAnCTL0.TAAnCE bit = 1.
The set value of the TAAnCCR0 register is transferred to the CCR0 buffer register. When the value of the 16-
bit counter matches the value of the CCR0 buffer register, a compare match interrupt request signal
(INTTAAnCC0) is generated. If TOAAn0 pin output is enabled at this time, the output of the TOAAn0 pin is
inverted.
When the TAAnCCR0 register is used as a cycle register in the interval timer mode, external event count mode,
external trigger pulse output mode, one-shot pulse output mode, or PWM output mode, the value of the 16-bit
counter is cleared (0000H) if its count value matches the value of the CCR0 buffer register.
(b) Function as capture register
When the TAAnCCR0 register is used as a capture register in the free-running timer mode, the count value of
the 16-bit counter is stored in the TAAnCCR0 register if the valid edge of the capture trigger input pin (TIAAn0
pin) is detected. In the pulse width measurement mode, the count value of the 16-bit counter is stored in the
TAAnCCR0 register and the 16-bit counter is cleared (0000H) if the valid edge of the capture trigger input pin
(TIAAn0) is detected.
Even if the capture operation and reading the TAAnCCR0 register conflict, the correct value of the TAAnCCR0
register can be read.
The following table shows the functions of the capture/compare register in each mode, and how to write data to the
compare register.
Table 7-3. Function of Capture/Compare Register in Each Mode and How to Write Compare Register
Operation Mode Capture/Compare Register How to Write Compare Register
Interval timer Compare register Anytime write
External event counter Compare register Anytime write
External trigger pulse output Compare register Batch write
One-shot pulse output Compare register Anytime write
PWM output Compare register Batch write
Free-running timer Capture/compare register Anytime write
Pulse width measurement Capture register
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