Fujitsu F2MC-16LX Hardware Manual page 211
Mb90470 series 16-bit microcontroller
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Also See for F2MC-16LX:
- Hardware manual (706 pages) ,
- Application note (13 pages) ,
- Operation manual (10 pages)
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Table 9.3-1 Functions of bits in timebase timer control register (TBTC)
Bit name
RESV:
Bit 15
Reserved bit
Bit 14
Unused bits
Bit 13
TBIE:
Bit 12
Interrupt request
permit bit
TBOF:
Bit 11
Interrupt request flag
bit
TBR:
Bit 10
Timebase timer
initializing bit
TBC1, TBC:
Bit 9
Interval time selection
Bit 8
bit
<Note>
Always write "1" to this bit.
•
Undefined value in reading
•
No effect on write operation
•
This bit permits or prohibits output of interrupt requests to the CPU.
•
An interrupt request is output if this bit and the interrupt request flag bit
(TBOF) are set to "1".
•
This bit is set to "1" when the bit specified by the timebase timer
counter overflows.
•
An interrupt request is output if this bit and the interrupt request permit
bit (TBIF) are set to "1".
•
This bit is cleared by writing "0" but is not changed by writing "1" so
that this operation does not affect other functions.
•
Reading by read-modify-write type instructions always returns "1".
<Notes>
•
Clearing of the interrupt request flag bit (TBOF) in the timebase timer
control register (TBTC) must be implemented in the state where the
timebase timer interrupt is prohibited by the interrupt request permit bit
(TBIE) or by the interrupt level mask register (ILM) setting of the
processor status (PS).
•
This bit is cleared to "0" by writing "0", a transition to the main stop
mode, a transition to the PLL stop mode, a transition from the sub-
clock mode to the main clock mode, a transition from the sub-clock
mode to the PLL clock mode, a transition from the main clock mode to
the PLL clock mode, or writing "0" to the timebase timer initializing bit
(TBR) or a reset.
•
This bit clears the timebase timer counter.
•
When "0" is written to this bit, the counter is cleared and the TBOF bit
is cleared. This bit is not changed by writing "1" so that this operation
does not affect other functions.
[Reference]
The readout value is always "1".
•
This bit specifies the cycle of the interval timer.
•
The bit for the interval timer in the timebase timer counter is specified.
•
The interval time can be selected out of four types.
CHAPTER 9 TIMEBASE TIMER
Function
195
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