tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 170

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

13.4 Timer Function
13. 16-bit Timer Counter (TCA)
RA001
13.4.4 Window mode
13.4.4.1 Setting
13.4.4.2 Operation
13.4.4.3 Auto capture
13.4.4.4 Register buffer configuration
the input pulse to the TCA0 pin (window pulse) and the internal clock.
In the window mode, the up counter counts up at the rising edge of the pulse that is logical anded product of
the source clock at TA0MOD<TA0CK>.
TA0MOD<TA0TED> to "0" enables counting up as long as the window pulse is at the "H" level. Setting
TA0MOD<TA0TED> to "1" enables counting up as long as the window pulse is at the "L" level.
in port settings.
TA0MOD and TA0CR<TA0OVE> is disabled. Be sure to complete the required mode settings before
starting the timer.
the up counter increments according to the source clock selected at TA0MOD<TA0CK>. When a match
between the up counter value and the value set to timer register A (TA0DRA) is detected, an INTTA0
interrupt request is generated and the up counter is cleared to "0000H". After being cleared, the up counter
restarts counting.
value. Define a frequency pulse that is sufficiently lower than the programmed internal source clock.
cleared to "0000H".
Setting the operation mode selection TA0MOD<TA0M> to "101" activates the window mode. Select
Select the window pulse level at the trigger edge input selection TA0MOD<TA0TED>. Setting
Note that this mode uses the TA0 input pin, and the TCA0 pin must be set to the input mode beforehand
The operation is started by setting TA0CR<TA0S> to "1". After the timer is started, writing to
After the operation is started, when the level selected at TA0MOD<TA0TED> is input to the TCA0 pin,
The maximum frequency to be supplied must be slow enough for the program to analyze the count
Setting TA0CR<TA0S> to "0" during the timer operation causes the up counter to stop counting and be
Refer to "13.4.1.3 Auto capture".
Refer to "13.4.1.4 Register buffer configuration".
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TMP89FM42