16-Bit Timer/Event Counter Mode; Interval Times When 8-Bit Timer/Event Counters 1 And; Are Used As 16-Bit Timer/Event Counters - NEC PD78076 User Manual

9.1.2 16-bit timer/event counter mode

(1) 16-bit interval timer
Interrupt requests can be generated at the preset time intervals.
Table 9-3. Interval Times when 8-Bit Timer/Event Counters 1 and 2
Minimum Interval Time
MCS = 1 MCS = 0
2 x 1/f 2
X
(400 ns) (800 ns)
2 2 x 1/f 2
X
(800 ns) (1.6 s)
3
2 x 1/f 2
X
(1.6 s) (3.2 s)
4
2 x 1/f 2
X
(3.2 s) (6.4 s)
2 5 x 1/f 2
X
(6.4 s) (12.8 s)
2 6 x 1/f 2
X
(12.8 s) (25.6 s)
7
2 x 1/f 2
X
(25.6 s) (51.2 s)
8
2 x 1/f 2
X
(51.2 s) (102.4 s)
2 9 x 1/f 2
X
(102.4 s) (204.8 s)
2 11 x 1/f 2
X
(409.6 s) (819.2 s)
Remarks 1. f
X
2. MCS : Bit 0 of oscillation mode selection register (OSMS)
3. Figures in parentheses apply to operation with f
226
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2

are Used as 16-Bit Timer/Event Counters

Maximum Interval Time
MCS = 1
2 x 1/f 2 17 x 1/f
X X
(26.2 ms)
3 x 1/f 2 18 x 1/f
X X
(52.4 ms)
4 19
x 1/f 2 x 1/f
X X
(104.9 ms)
5 20
x 1/f 2 x 1/f
X X
(209.7 ms)
6 x 1/f 2 21 x 1/f
X X
(419.4 ms)
7 x 1/f 2 22 x 1/f
X X
(838.9 ms)
8 23
x 1/f 2 x 1/f
X X
(1.7 s)
9 24
x 1/f 2 x 1/f
X X
(3.4 s)
10 x 1/f 2 25 x 1/f
X X
(6.7 s)
12 x 1/f 2 27 x 1/f
X X
(26.8 s)
: Main system clock oscillation frequency
Resolution
MCS = 0 MCS = 1
2 18 x 1/f 2 x 1/f
X X
(52.4 ms) (400 ns)
2 19 x 1/f 2 2 x 1/f
X X
(104.9 ms) (800 ns)
20 3
2 x 1/f 2 x 1/f
X X
(209.7 ms) (1.6 s)
21 4
2 x 1/f 2 x 1/f
X X
(419.4 ms) (3.2 s)
2 22 x 1/f 2 5 x 1/f
X X
(838.9 ms) (6.4 s)
2 23 x 1/f 2 6 x 1/f
X X
(1.7 s) (12.8 s)
24 7
2 x 1/f 2 x 1/f
X X
(3.4 s) (25.6 s)
25 8
2 x 1/f 2 x 1/f
X X
(6.7 s) (51.2 s)
2 26 x 1/f 2 9 x 1/f
X X
(13.4 s) (102.4 s)
2 28 x 1/f 2 11 x 1/f
X X
(53.7 s) (409.6 s)
= 5.0 MHz.
X
MCS = 0
2 2 x 1/f
X
(800 ns)
2 3 x 1/f
X
(1.6 s)
4
2 x 1/f
X
(3.2 s)
5
2 x 1/f
X
(6.4 s)
2 6 x 1/f
X
(12.8 s)
2 7 x 1/f
X
(25.6 s)
8
2 x 1/f
X
(51.2 s)
9
2 x 1/f
X
(102.4 s)
2 10 x 1/f
X
(204.8 s)
2 12 x 1/f
X
(819.2 s)