UPD70F3208 Datasheet, PDF (316/757 Pages) NEC – 32-Bit Single-Chip Microcontrollers

CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 TO 05
(d) Prescaler mode register 03 (PRM03)
After reset: 00H R/W Address: FFFFF637H
7
6
5
4
3
PRM03 ES311 ES310 ES301 ES300
0
2
1
0
0
PRM031 PRM030
ES311
0
0
1
1
ES310
Selection of valid edge of TI031
0 Falling edge
1 Rising edge
0 Setting prohibited
1 Both rising and falling edges
ES301
0
0
1
1
ES300
Selection of valid edge of TI030
0 Falling edge
1 Rising edge
0 Setting prohibited
1 Both rising and falling edges
PRM031 PRM030
Selection of count clock^{Note 1}
Count clock
fXX
20 MHz
16 MHz
0
0
fXX/4
200 ns
250 ns
0
1
fXX/16
800 ns
1 µs
1
0
fXX/512
25.6 µ s
32 µ s
1
1
Valid edge of TI030^{Note 2}
–
–
Notes 1. When the internal clock is selected, set so as to satisfy the following conditions.
VDD = 4.0 to 5.5 V: Count clock ≤ 10 MHz
VDD = 2.7 to 4.0 V: Count clock ≤ 5 MHz
2. The external clock requires a pulse longer than two internal clocks (fXX/4).
Remark fXX: Internal system clock frequency
316
User’s Manual U15862EJ3V0UD