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CHAPTER 5 TIME-BASE TIMER
Table 5.3-1 Explanation of Functions of Each Bit in Time-base Timer Control Register (TBTC)
Bit name Description
bit7
TBOF:
Overflow interrupt request
flag bit
• This bit is set to "1" when the specified bit of the time-base timer counter
overflows.
• An interrupt request is sent when this bit and the interrupt request enable bit
(TBIE) are both "1".
• While this bit is written, it is cleared when "0" is specified, and nothing is
changed and affected when "1" is specified.
bit6
TBIE:
Interrupt request enable bit
This bit enables or disables an interrupt request to be output to the CPU. An
interrupt request is output when this bit and the overflow interrupt request flag bit
(TBOF) are both "1".
bit5
to
bit3
Unused bits
• These bits are undefined when they are read.
• Nothing is affected when they are written.
bit2,
bit1
TBC1, TBC0:
Time interval selection bits
• These bits specify a time interval for the interval timer.
• The interval timer bits of the time-base timer counter are specified.
• One of four time intervals can be selected.
bit0
TBR:
Time-base timer
initialization bit
• This bit clears the time-base timer counter.
• The counter is cleared to 000000
H
when "0" is written to this bit, nothing is
changed and affected when "1" is written.
Note:
This bit is always "1" at the beginning of reading.