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(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.
Caution When the GOM bit of the CGST register is 1, write accessing the CGCS register is
prohibited.
15
14
13
12
CGTS
CGTS
CGTS
CGTS
CGTS
CGCS
7
6
5
4
Bit position
Bit name
15 to 8
CGTS7 to
CGTS0
7, 6
GTCS1,
GTCS0
Notes 1.
When writing to this bit, always set it to 0.
2.
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
3.
Refer to 11.10 (17) CAN time stamp count register (CGTSC).
CHAPTER 11 FCAN CONTROLLER
11
10
9
8
7
6
CGTS
CGTS
CGTS
GTCS
GTCS
3
2
1
0
1
0
Indicates global timer system clock (f
n
CGTS
CGTS
CGTS
CGTS
7
6
5
4
0
0
0
0
0
1
0
0
0
0
:
127
0
1
1
1
:
254
1
1
1
1
255
1
1
1
1
The global timer system clock (f
is used for the time stamp function.
Specifies the global timer clock (f
GTCS1
GTCS0
0
0
0
1
1
0
1
1
User's Manual U14492EJ5V0UD
5
4
3
2
1
0
Note 1
0
0
MCP3
MCP2
MCP1
MCP0
Function
) (see Figure 11-26).
GTS
CGTS
CGTS
CGTS
CGTS
3
2
1
0
0
0
0
0
f
GTS
0
0
0
1
f
GTS
f
GTS
1
1
1
1
f
GTS
f
GTS
1
1
1
0
f
GTS
1
1
1
1
f
GTS
) is the source clock for the time stamp counter
GTS
) (see Figure 11-26).
GTS1
Global timer clock selection (f
f
/2
MEM
f
/4
MEM
f
/8
MEM
f
/16
MEM
(1/2)
Address
Initial value
Note 3
xxxxmC14H
7F05H
System timer prescaler
selection
f
= f
/(n + 1)
GTS
GTS1
= f
/1
GTS1
= f
/2
GTS1
= f
/(n + 1)
GTS1
= f
/128 (after reset)
GTS1
= f
/(n + 1)
GTS1
= f
/255
GTS1
= f
/256
GTS1
Note 3
that
)
GTS1
569
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