CHAPTER 11 FCAN CONTROLLER
574
User’s Manual U14492EJ3V0UD
(16) CAN main clock selection register (CGCS)
The CGCS register is used to select the main clock.
This register can be read/written in 16-bit units.
(1/2)
14
CGTS
6
13
CGTS
5
12
CGTS
4
2
MCP2
3
MCP3
4
0
5
0
6
GTCS
0
7
GTCS
1
8
CGTS
0
9
CGTS
1
10
CGTS
2
11
CGTS
3
15
CGTS
7
1
MCP1
0
MCP0
CGCS
Address
xxxxmC14H
Note
Initial value
7F05H
Note
xxxx: CAN message buffer registers can be allocated to the xxxx addresses as programmable
peripheral I/O registers. Note, however, that the xxxx addresses cannot be changed after being
set.
m = 2, 6, A, E
Bit Position
Bit Name
Function
Indicates global timer system clock (f
GTS
) (see
Figure 11-25
).
n
CGTS
7
CGTS
6
CGTS
5
CGTS
4
CGTS
3
CGTS
2
CGTS
1
CGTS
0
System Timer Prescaler
Selection
f
GTS
= f
GTS1
/(n + 1)
0
0
0
0
0
0
0
0
0
f
GTS
= f
GTS1
/1
1
0
0
0
0
0
0
0
1
f
GTS
= f
GTS1
/2
:
f
GTS
= f
GTS1
/(n + 1)
127
0
1
1
1
1
1
1
1
f
GTS
= f
GTS1
/128 (after reset)
:
f
GTS
= f
GTS1
/(n + 1)
254
1
1
1
1
1
1
1
0
f
GTS
= f
GTS1
/255
255
1
1
1
1
1
1
1
1
f
GTS
= f
GTS1
/256
The global timer system clock (f
GTS
) is the source clock for the time stamp counter
Note
that
is used for the time stamp function.
15 to 8
CGTS7 to
CGTS0
Specifies the global timer clock (f
GTS1
) (see
Figure 11-25
).
GTCS1
GTCS0
Global Timer Clock Selection (f
GTS1
)
0
0
f
MEM
/2
0
1
f
MEM
/4
1
0
f
MEM
/8
1
1
f
MEM
/16
7, 6
GTCS1,
GTCS0
Note
Refer to
11.10 (17) CAN time stamp count register (CGTSC)
.
Содержание V850E/IA1 mPD703116
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