NEC mPD780344 Series, Руководство пользователя

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167
CHAPTER 7 8-BIT TIMERS A0, B0
User’s Manual U15798EJ2V0UD
Table 7-3. Interval Time of Timer A0
TCLA01 TCLA00 Minimum Interval Time Maximum Interval Time Resolution
0 0 2
4
/f
X
(1.6
µ
s) 2
12
/f
X
(410
µ
s) 2
4
/f
X
(1.6
µ
s)
0 1 2
6
/f
X
(6.4
µ
s) 2
14
/f
X
(1.64 ms) 2
6
/f
X
(6.4
µ
s)
1 0 Input cycle of timer B0 Input cycle of timer B0 Input cycle of timer B0
match signal match signal
×
2
8
match signal
1 1 Input cycle of timer B0 Input cycle of timer B0 Input cycle of timer B0
output output
×
2
8
Remarks 1. f
X
: Main system clock oscillation frequency
2. The parenthesized values apply to operation at f
X
= 10.0 MHz
Table 7-4. Interval Time of Timer B0
TCLB02 TCLB01 TCLB00 Minimum Interval Time Maximum Interval Time Resolution
0 0 0 2
2
/f
X
(0.4
µ
s) 2
10
/f
X
(102 ms) 2
2
/f
X
(0.4
µ
s)
0 0 1 2
3
/f
X
(0.8
µ
s) 2
11
/f
X
(205 ms) 2
3
/f
X
(0.8
µ
s)
0 1 0 f
TMI
input cycle f
TMI
input cycle
×
2
8
f
TMI
input cycle
0 1 1 f
TMI
/2 input cycle f
TMI
/2 input cycle
×
2
8
f
TMI
/2 input cycle
1 0 0 f
TMI
/2
2
input cycle f
TMI
/2
2
input cycle
×
2
8
f
TMI
/2
2
input cycle
1 0 1 f
TMI
/2
3
input cycle f
TMI
/2
3
input cycle
×
2
8
f
TMI
/2
3
input cycle
Remarks 1. f
X
: Main system clock oscillation frequency
2. f
TMI
: Input frequency from TMIB0 pin
3. The parenthesized values apply to operation at f
X
= 10.0 MHz
Figure 7-8. Timing of Interval Timer Operation with 8-Bit Resolution (Basic Operation)
Remarks 1. Interval time = (N + 1)
×
t: N = 00H to FFH
2. n = A, B
Count stop
Count clock
CRn0
TCEn0
INTTMn0
TOn0
N
t
TMn0
N
00H 01H
N
00H 01H N 00H 00H 01H
00H
01H
Clear Clear Clear
Count start
Interrupt acknowledgement Interrupt acknowledgement Interrupt acknowledgement
Interval time Interval time Interval time