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CHAPTER 19 INTERRUPT FUNCTIONS
(5) Prescaler mode register (PRM0)
This register specifies the valid edge for TI00/P40 to TI02/P42 pins input.
PRM0 is set with an 8-bit memory manipulation instruction.
RESET input sets this register to 00H.
Figure 19-6. Prescaler Mode Register (PRM0) Format
Address: FF70H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
PRM0
ES21
ES20
ES11
ES10
ES01
ES00
PRM01
PRM00
ES21
ES20
TI02 Valid Edge Selection
0
0
Falling edge
0
1
Rising edge
1
0
Setting prohibited
1
1
Both rising and falling edges
ES11
ES10
TI01 Valid Edge Selection
0
0
Falling edge
0
1
Rising edge
1
0
Setting prohibited
1
1
Both rising and falling edges
ES01
ES00
TI00 Valid Edge Selection
0
0
Falling edge
0
1
Rising edge
1
0
Setting prohibited
1
1
Both rising and falling edges
Caution
Set the valid edge of the TI00/P40 to TI02/P42 pins after setting bit 2 of 16-bit timer mode
control register 0 (TMC0) to 0 to stop the timer operation.
Содержание mPD780973 Series
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