NEC PD78214 User Manual
Page 215
186
µ
PD78214 Sub-Series
Fig. 7-90 shows an example of PPG output using 8-bit timer 2 (TM2). Fig. 7-91 shows an example of PPG output
when CR20 = CR21. Fig. 7-92 shows an example of PPG output when CR20 = 00H.
Fig. 7-90 Example of PPG Output Using TM2
Remark ALV2 = 0, ALV3 = 0
Table 7-18 PPG Output on TO2 (f
CLK
= 6 MHz)
Count clock
f
CLK
/16
f
CLK
/32
f
CLK
/64
f
CLK
/128
f
CLK
/256
f
CLK
/512
Minimum pulse width
Note
2.67
µs
5.33
µs
10.7
µs
21.3
µs
42.7
µs
85.3
µs
PPG period
5.33
µs to 683 µs
10.7
µs to 1.37 ms
21.3
µs to 2.73 ms
42.7
µs to 5.46 ms
85.3
µs to 10.9 ms
171
µs to 21.8 ms
PPG frequency
187.5 kHz to 1.46 kHz
93.75 kHz to 732 Hz
46.9 kHz to 366 Hz
23.4 kHz to 183 Hz
11.7 kHz to 91.6 Hz
5.86 kHz to 45.8 Hz
Note The case where CR20 = 0 is excluded.
CR21
INTC20
Count starts
CR21
CR21
CR20
CR20
CR20
INTC21
TO2
(PPG output)
TO3
(timer output)
Pulse period
Pulse
width
T
TM2
count value
0H