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7721 데이터시트(PDF) 147 Page - Renesas Technology Corp

부품명 7721
상세설명  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 데이터시트(HTML) 147 Page - Renesas Technology Corp

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TIMER A
7721 Group User’s Manual
8–28
8.4 Event counter mode
[Precautions for event counter mode]
1. While counting is in progress, by reading the timer Aj register, the counter value can be read out at any
timing. However, if the timer Aj register is read at the reload timing shown in Figure 8.4.9, the value
“FFFF16” (at an underflow) or “000016” (at an overflow) is read out. If reading is performed in the period
from when a value is set into the timer Aj register with the counter stopped until the counter starts
counting, the set value is correctly read out.
Fig. 8.4.9 Reading timer Aj register
2. The TAjOUT pin is used for all functions listed below. Accordingly, only one of these functions can be
selected for each timer.
•Switching between countup and countdown by TAjOUT pin’s input signal
•Pulse output function
•Two-phase pulse signal processing function
21
0
n
n – 1
Counter value
(Hex.)
21
0
FFFF n – 1
Read value
(Hex.)
Reload
Time
n = Reload register’s contents
(1) For countdown
FFFD FFFE FFFF
n
n + 1
FFFD FFFE FFFF 0000 n + 1
(2) For countup
Counter value
(Hex.)
Read value
(Hex.)
Reload
Time
n = Reload register’s contents



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