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CHAPTER 13 16-Bit I/O TIMER
Table 13.3-3 Functions of Timer Control Status Register (Lower) (TCCSL)
Bit name Function
bit7 IVF:
Timer overflow generation
flag bit
This bit indicates the timer overflow.
[Condition set to "1"]
Condition is set when the following is used.
• When 16-bit free-run timer overflows
[When set to "1"]
When the timer overflow interrupt request is set to enable (TCCSL:IVFE=1)
if the IVF bit is set to "1", the interrupt request is generated.
When set to "0": The bit is cleared.
When set to "1": No effect.
Read by read modify write instructions: "1" is always read.
bit6 IVFE:
Timer overflow interrupt
enable bit
This bit enables or disables the interrupt request when the IVF bit is set to
"1".
When set to "1": When the IVF bit is set to "1", the interrupt request is
generated.
When set to "0": The generation of the interrupt request is disabled.
bit5 STOP:
Timer operation stop bit
This bit enables or disables (stops) the operation of the 16-bit free-run timer.
When set to "0": Enable the timer operation and count up with count clock
set by the CLK2 to CLK0.
When set to "1":Stops count operation
bit4 Reserved bit Always set this bit to "0".
bit3 CLR:
Timer clear bit
This bit clears the counter (TCDT) of the 16-bit free-run timer.
When set to "1": Clears timer data register (TCDT) to "0000
H
"
When set to "0": No effect.
Read: "0" is always read.
Note:
When clearing during stopping of the 16-bit free-run timer
(TCCSL:STOP=1), write "0000
H
" to the TCDT directly.
bit2
bit1
bit0
CLK2, CLK1, CLK0:
Count clock cycle selection
bits
These bits set the count clock to cycle of the 16-bit free-run timer.
Note:
Set the count clock cycle during stopping of the input capture operation
(ICSnm: EGn1, EGn0="00
B
" or ICSnm:EGm1, EGm0="00
B
").
n=0, 2 m=n+1