Fujitsu F2MC-8FX Hardware Manual page 525

Table 27.3-3 Functional Description of Bits of Auto-Calibration Control Register
Bit name
CALEN:
Bit4 Auto-calibration
enable bit
CALIRQ:
Calibration
Bit3
completion interrupt
enable bit
CALCP:
Bit2 Auto-calibration
status bit
CALOF:
Calibration Result
Bit1
overflow
CALUF:
Bit0 Calibration Result
underflow
Notes:
Hardware writing can override software writing in CALCR:CALCP/CALOF/CALUF.
• Write "0" : the auto-calibration function is disabled.
• Write "1" : The auto-calibration function is enabled.
• This bit is cleared by reset.
• This bit is set to "0" automatically by hardware after the calibation is completed even
overflow or underflow.
• Write "0" : The auto-calibration completion interrupt is masked .
• Write "1" : The auto-calibration completion interruption can be issued when the auto-
calibration is completed even overflow or underflow.
• This setting is valid only if the CALEN is asserted high.
• This bit is cleared by reset.
• Write "0" : The interrupt request has not been sent.
• Write "1" : The interrput requested has been sent after auto-calibration is completed
when calibraion completion interrupt function is enabled (CALCR:CALIRQ = 1)
• Writing "0" to CALCP clear the bit, writing "1" to it has no effect, RMW read return "1".
• This bit is cleared by reset.
• This bit is set to "1" when the auto-calibration offset result in FFTR is greater than 127,
which suggest CALPL is much faster than 1Hz so the offset value overflow.
• This bit is set to "0" when no overflow happens.
• Write "0" : clear this bit
• Write "1" : no effect.
• RMW read will return "1".
• This bit is cleared by reset.
• This bit is set to "1" when the auto-calibration offset result in FFTR is smaller than -128,
which suggests the frequency of CALPL is much slower than 1Hz so the offset value
underflow.
• This bit is set to "0" when no underflow happens.
• Write "0" : clear this bit
• Write "1" : no effect
• RMW read will return "1"
• This bit is cleared by reset.
CHAPTER 27 REAL TIME CLOCK
Function
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