Fujitsu FR81S User Manual
CHAPTER 24: 16-BIT FREE-RUN TIMER
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : 16-BIT FREE-RUN TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
27
FRS1: Address 123A
H
(Access: Byte, Half-word, Word)
bit15
bit14
bit13
bit12
bit11
bit10
bit9
bit8
Reserved
IS31
IS30
Reserved
IS21
IS20
Initial value
0
0
0
0
0
0
0
0
Attribute
R0,W0
R0,W0
R/W
R/W
R0,W0
R0,W0
R/W
R/W
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Reserved
IS11
IS10
Reserved
IS01
IS00
Initial value
0
0
0
0
0
0
0
0
Attribute
R0,W0
R0,W0
R/W
R/W
R0,W0
R0,W0
R/W
R/W
[bit15, bit14] Reserved
Always write 0 to this bit.
[bit13, bit12] IS31, IS30: Input capture free-run timer selector selection bits
IS31
IS30
Function
0
0
Free-run timer 0
0
1
Free-run timer 1
1
0
Free-run timer 2
Others
Setting disabled (operation is not guaranteed)
⋅
These bits are used to configure the free-run timer assigned to the input capture.
Note:
Before configuring these bits, make sure to verify that the free-run timer is inactive.
[bit11, bit10] Reserved
Always write 0 to this bit.
[bit9, bit8] IS21, IS20: Input capture free-run timer selector selection bits
IS21
IS20
Function
0
0
Free-run timer 0
0
1
Free-run timer 1
1
0
Free-run timer 2
Others
Setting disabled (operation is not guaranteed)
⋅
These bits are used to configure the free-run timer assigned to the input capture.
Note:
Before configuring these bits, make sure to verify that the free-run timer is inactive.
[bit7, bit6] Reserved
Always write 0 to this bit.
MB91520 Series
MN705-00010-1v0-E
934