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CHAPTER 19 FCAN CONTROLLER (V850/SC3)
User’s Manual U15109EJ3V0UD
601
19.5.15 CAN main clock select register (CGCS)
The CGCS register is used to select the CAN 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.
After reset: 7F05H
R/W
Address: xx3FFC14H
15
14
13
12
11
10
9
8
CGCS
CGTS7
CGTS6
CGTS5
CGTS4
CGTS3
CGTS2
CGTS1
CGTS0
7
6
5
4
3
2
1
0
GTCS1
GTCS0
0
0
Note 1
MCP3
MCP2
MCP1
MCP0
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 2
that is
used for the time stamp function.
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
n
MCP3 MCP2 MCP1 MCP0
Selection of clock to memory access controller (f
MEM
)
0
0
0
0
0
f
MEM1
1
0
0
0
1
f
MEM1
/2
2
0
0
1
0
f
MEM1
/3
:
f
MEM1
/(n+1)
14
1
1
1
0
f
MEM1
/15
15
1
1
1
1
f
MEM1
/16
Once the values of the MCP3 to MCP0 bits are set after reset is released, do not change
these values.
Notes 1.
When writing to this bit, always set it to 0.
2.
See
19.5.16 CAN time stamp count register (CGTSC)
.