Fujitsu FR81S User Manual
CHAPTER 21: 32-BIT FREE-RUN TIMER
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: 32-BIT FREE-RUN TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
19
4.2.1. Free-run timer selection register : FRS
The bit configuration of the free-run timer selection register is shown.
This register is used to control the operation of the free-run timer.
FRS8: Address 0071
H
(Access: Byte, Half-word, Word)
bit23
bit22
bit21
bit20
bit19
bit18
bit17
bit16
-
-
OS111
OS110
-
-
OS101
OS100
Initial value
0
0
0
0
0
0
0
0
Attribute R0,WX
R0,WX
R/W
R/W
R0,WX
R0,WX
R/W
R/W
bit15
bit14
bit13
bit12
bit11
bit10
bit9
bit8
-
-
OS91
OS90
-
-
OS81
OS80
Initial value
0
0
0
0
0
0
0
0
Attribute R0,WX
R0,WX
R/W
R/W
R0,WX
R0,WX
R/W
R/W
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
-
-
OS71
OS70
-
-
OS61
OS60
Initial value
0
0
0
0
0
0
0
0
Attribute R0,WX
R0,WX
R/W
R/W
R0,WX
R0,WX
R/W
R/W
[bit23, bit22] : Undefined
The read value is "0". Writing has no effect on operation.
[bit21, bit20] OS111, OS110 : free-run timer selector for output compare 11
OS111
OS110
Function
0
0
Free-run timer 3
0
1
Free-run timer 4
1
0
Free-run timer 5
1
1
Setting prohibit
(operation is not guaranteed)
These bits are used to configure the free-run timer assigned to the output compare 11.
Note:
Before configuring these bits, make sure to verify that the free-run timer is inactive.
[bit19, bit18] : Undefined
The read value is "0". Writing has no effect on operation.
MB91520 Series
MN705-00010-1v0-E
814