Toshiba TMP91C815F Data Book page 209

3.13.5 Operational description
(1) Reading timer data
①
There is the case which reads wrong data when carry of the inside counter happens during the operation which
timer data reads. Therefore, please read two times with the following way for reading correct data.
As shown in figure 3.13(2), confirm the data by reading twice and compare them in case reading timer data. If it
happen to take up a digit, the comparing result becomes incorrect. Therefore, It should be read data
START
PAGER<PA0>='0',
Select PAGE0
Read the timer data
(1st)
Read the timer data
(2'nd)
1'st data = 2'nd data
YES
END
Figure 3.13(2) Flowchart of timer data read
91C815-
206
TMP91C815
NO
again.