CHAPTER 7 TIMER/COUNTER FUNCTION
User’s Manual U13850EJ4V0UM
185
(5) Prescaler mode registers 10, 11 (PRM10, PRM11)
PRM1n selects a count clock of the 16-bit timer (TM1) and the valid edge of TI1n input. PRM10 and PRM11 are
set by an 8-bit memory manipulation instruction.
RESET input clears PRM10 and PRM11 to 00H.
Figure 7-7. Prescaler Mode Register 10 (PRM10)
After reset: 00H R/W
Address: FFFFF216H
7
6
5
4
3
2
1
0
PRM10
ES111
ES110
ES101
ES100
0
0
PRM11
PRM10
ES111
ES110
Selects valid edge of TI11
0
0
Falling edge
0
1
Rising edge
1
0
Setting prohibited
1
1
Both rising and falling edges
ES101
ES100
Selects valid edge of TI10
0
0
Falling edge
0
1
Rising edge
1
0
Setting prohibited
1
1
Both rising and falling edges
Count clock selection
f
XX
PRM12
Note 1
PRM11
PRM10
Count clock
20 MHz
Note 3
12.58 MHz
0
0
0
f
XX
/2
100 ns
158 ns
0
0
1
f
XX
/4
200 ns
318 ns
0
1
0
f
XX
/16
800 ns
1.3
µ
s
0
1
1
TI10 valid edge
Note 2
−
−
1
0
0
f
XX
/32
1.6
µ
s
2.5
µ
s
1
0
1
f
XX
/128
6.4
µ
s
10.2
µ
s
1
1
0
f
XX
/256
12.8
µ
s
20.3
µ
s
1
1
1
Setting prohibited
−
−
Notes 1.
Bit 0 of the PRM11 register
2.
The external clock requires a pulse longer than twice that of the internal clock (f
XX
/2).
3.
Only for the V850/SB1.
Содержание MPD703030A
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