NEC 78K0 Series User Manual page 185

CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 AND 01
Figure 7-13. Format of Prescaler Mode Register 00 (PRM00)
Address: FFBBH After reset: 00H
Symbol 7
PRM00 ES101
ES101
0
0
1
1
ES001
0
0
1
1
PRM001
0
0
1
1
Note The external clock requires a pulse two cycles longer than internal clock (f
Remark f : Peripheral hardware clock frequency
PRS
R/W
6 5
ES100 ES001 ES000
ES100
0 Falling edge
1 Rising edge
0 Setting prohibited
1 Both falling and rising edges
ES000
0 Falling edge
1 Rising edge
0 Setting prohibited
1 Both falling and rising edges
PRM000
f
PRS
0 f 2 MHz
PRS
2
1 f /2 500 kHz
PRS
8
0 f /2 7.81 kHz
PRS
Note
1 TI000 valid edge
Preliminary User's Manual U17260EJ3V1UD
4 3 2
0 0
TI010 pin valid edge selection
TI000 pin valid edge selection
Count clock selection
= 2 MHz f = 5 MHz
PRS
5 MHz
1.25 MHz
19.53 kHz
PRS
1 0
PRM001 PRM000
f = 10 MHz f = 20 MHz
PRS PRS
10 MHz 20 MHz
2.5 MHz 5 MHz
39.06 kHz 78.12 kHz
).
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