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7721 Datasheet(PDF) 185 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 185 Page - Renesas Technology Corp

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7721 Group User’s Manual
TIMER B
9–18
9.4 Event counter mode
[Precautions for event counter mode]
While counting is in progress, by reading the timer Bj register, the counter value can be read out at any
timing. However, if the timer Bj register is read at the reload timing shown in Figure 9.4.4, the value
“FFFF16” is read out. If reading is performed in the period from when a value is set into the timer Bj register
with the counter stopped until the counter starts counting, the set value is correctly read out.
Fig. 9.4.4 Reading timer Bj register
21
0
n
n – 1
Counter value
(Hex.)
21
0
FFFF n – 1
Read value
(Hex.)
Reload
Time
n = Reload register’s contents



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