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TIMER A
5.3 Timer mode
[Precautions when operating in timer mode]
By reading the timer Ai register, the counter value can be read out at any timing while counting is in
progress. However, if the timer Ai register is read at the reload timing shown in Figure 5.3.7, the value
"FFFF
" is read out. When reading the timer Ai register after setting a value to the register while counting
16
is not in progress and before the counter starts counting, the set value is read out correctly.
Fig. 5.3.7 Reading timer Ai register
5–18
Counter value
2
(Hex.)
Read value
2
(Hex.)
n = Reload register's contents
7751 Group User's Manual
Reload
n
n – 1
1
0
FFFF n – 1
1
0
Time
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