CHAPTER 7 16-BIT TIMER/EVENT COUNTERS 00 AND 01
Preliminary User’s Manual U17260EJ3V1UD
186
Figure 7-14. Format of Prescaler Mode Register 01 (PRM01)
Address: FFB7H After reset: 00H R/W
Symbol
7 6 5 4 3 2 1 0
PRM01 ES111 ES110 ES011 ES010
0
0 PRM011
PRM010
ES111
ES110
TI011 pin valid edge selection
0 0
Falling
edge
0 1
Rising
edge
1 0
Setting
prohibited
1
1
Both falling and rising edges
ES011
ES010
TI001 pin valid edge selection
0 0
Falling
edge
0 1
Rising
edge
1 0
Setting
prohibited
1
1
Both falling and rising edges
Count clock selection
PRM011 PRM010
f
PRS
= 2 MHz
f
PRS
= 5 MHz
f
PRS
= 10 MHz f
PRS
= 20 MHz
0 0
f
PRS
2 MHz
5 MHz
10 MHz
20 MHz
0 1
f
PRS
/2
4
125 kHz
312.5 kHz
625 kHz
1.25 MHz
1 0
f
PRS
/2
6
31.25 kHz
78.125 kHz
156.25 kHz
312.5 kHz
1 1
TI001
valid
edge
Note
Note
The external clock requires a pulse two cycles longer than internal clock (f
PRS
).
Remark
f
PRS
: Peripheral hardware clock frequency