Fujitsu MB90335 Series Hardware Manual page 315

CHAPTER 13 PWC TIMER
13.2 Register of PWC Timer
Table 13.2-2 Functions for Read Operation (Displaying the 16-bit Up-count Timer Operation Status)
STRT STOP
0 0
1 1
• Initialized to "00
• Read and write are enabled. However, meanings are different between when writing and reading as
shown in Table 13.2-1 and Table 13.2-2.
• The value read by read-modify-write instructions is always "11
• Note that no bit instruction can be used for reading in the operating status (reading always produces the
operating status) although the bit instruction (bit clear) can be used for either STRT or STOP bit to start
or stop the timer.
[bit13] EDIR (measurement end interrupt request flag)
This flag indicates the measurement termination in the pulse width measurement. When the
measurement termination interrupt factor is permitted (bit12: EDIE = 1) and this bit is set, the
measurement termination interrupt request occurs.
EDIR
Set factor Set when the pulse width measurement terminates (measured results are stored in PWCR).
Clear factor Because PWCR (measurement result) is read, it is clear.
• Initialized to "0" at reset.
• Only reading is allowed.
• Bit values cannot be changed by writing.
[bit12] EDIE (measurement end interruption permission)
Measurement termination interrupt request during the pulse width measurement is controlled as shown
in the table below:
EDIE
Measurement end interrupt request output disabled (interrupt is not generated even if EDIR is set).
0
[Initial value]
1 Measurement end interrupt request output enabled (interrupt is generated if EDIR is set).
• Initialized to "0" at reset.
• Reading or writing is allowed.
294
Timer under suspension (unstarted or measurement completed). [initial value]
During timer count operating (during measurement).
" at reset.
B
Operation mode
Operation mode
FUJITSU MICROELECTRONICS LIMITED
Operation control functions
" regardless of the bit value.
B
MB90335 Series
CM44-10137-6E