Square-Wave Output Ranges When 2-Channel 8-Bit Timer/Event Counters Tm1 And Tm2) Are Used As 16-Bit Timer/Event Counter - NEC PD78076 User Manual

(3) Square-wave output operation
The 8-bit timer/event counters 1 and 2 operate as square wave outputs with any selected frequency at
intervals of the value preset to 8-bit compare registers (CR10 and CR20). To set the count value, set the
values of the higher 8 bits to CR20 and set the values of the lower 8 bits to CR10.
The TO2/P32 pin output status is reversed at intervals of the count value preset to CR10 and CR20 by setting
bit 4 (TOE2) of the 8-bit timer output control register (TOC1) to 1. This enables a square wave with any
selected frequency to be output.
Table 9-10. Square-Wave Output Ranges when 2-Channel 8-Bit Timer/Event Counters
(TM1 and TM2) are Used as 16-Bit Timer/Event Counter
Minimum Pulse Width
MCS = 1 MCS = 0
2 x 1/f 2 2 x 1/f
X
(400 ns) (800 ns)
2 2 x 1/f 2 3 x 1/f
X
(800 ns) (1.6 s)
3 4
2 x 1/f 2 x 1/f
X
(1.6 s) (3.2 s)
2 4 x 1/f 2 5 x 1/f
X
(3.2 s) (6.4 s)
2 5 x 1/f 2 6 x 1/f
X
(6.4 s) (12.8 s)
6 7
2 x 1/f 2 x 1/f
X
(12.8 s) (25.6 s)
7 8
2 x 1/f 2 x 1/f
X
(25.6 s) (51.2 s)
8 9
2 x 1/f 2 x 1/f
X
(51.2 s) (102.4 s)
2 9 x 1/f 2 10 x 1/f
X
(102.4 s) (204.8 s)
2 11 x 1/f 2 12 x 1/f
X
(409.6 s) (819.2 s)
Remarks 1. f : Main system clock oscillation frequency
X
2. MCS : Bit 0 of oscillation mode selection register (OSMS)
3. Figures in parentheses apply to operation with f
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
Maximum Pulse Width
MCS = 1
2 17 x 1/f
X X
(26.2 ms)
2 18 x 1/f
X X
(52.4 ms)
19
2 x 1/f
X X
(104.9 ms)
2 20 x 1/f
X X
(209.7 ms)
2 21 x 1/f
X X
(419.4 ms)
22
2 x 1/f
X X
(838.9 ms)
23
2 x 1/f
X X
(1.7 s)
24
2 x 1/f
X X
(3.4 s)
2 25 x 1/f
X X
(6.7 s)
2 27 x 1/f
X X
(26.8 s)
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)
2 21 x 1/f 2 4 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)
23 6
2 x 1/f 2 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)
2 5 x 1/f
X
(6.4 s)
2 6 x 1/f
X
(12.8 s)
7
2 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)
245