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CHAPTER 12 16-BIT RELOAD TIMER
Table 12.4-2 Timer Control Status Register (TMCSRL0/TMCSRL1)
Bit name
OUTE:
bit6
Timer output enable bit
OUTL:
bit5
Pin output level
selection bit
RELD:
bit4
Reload selection bit
INTE:
bit3
Interrupt request
enable bit
UF:
bit2
Underflow interrupt
request flag bit
CNTE:
bit1
Count enable bit
TRG:
bit0
Software trigger bit
240
• This bit enables or disables output from the timer output pin.
• When this bit is "0", the pin functions as a general-purpose port. When this bit is
"1", the pin functions as a timer output pin.
• In reload mode, the output waveform of this timer output pin
toggles. In single-shot mode, the timer outputs a rectangular
waveform that indicates that counting is in progress is output.
• This register is used to select the output level of the timer output pin.
• The output level of the pin is inverted depending on whether this bit is "0" or "1".
• This bit enables reloading.
• When this bit is "1", the timer is in reload mode. At the same time an underflow
occurs, the contents of the reload register are loaded into the counter, and counting
continues.
• When this bit is "0", the timer is in single-shot mode. Counting stops when an
underflow occurs.
• This bit enables or disables underflow interrupt request to the CPU.
• When this bit and the underflow interrupt request flag (UF) bit are "1", the timer
outputs an interrupt request.
• This bit is set to "1" when a counter underflow occurs.
• Writing "0" to this bit clears it. Writing "1" to this bit does not change the bit value
and has no effect on other bits.
• This bit is also cleared when EI
• The bit enables or disables counting.
• When this bit is set to "1", the counter is placed in trigger standby mode. When a
trigger occurs, actual counting starts.
• This bit starts the interval timer function or counter function with software.
• Writing "1" to this bit applies a software trigger, causing the contents of the reload
register to be loaded into the counter and starting counter operation. Writing "0" to
this bit has no effect.
• Trigger input from this trigger is always valid when the CNTE bit is set to "1"
regardless of the operating mode.
Function
2
OS is activated.
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