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Chapter 14
FCAN Interface Function
Preliminary User’s Manual U15839EE1V0UM00
14.3.2 Common
registers
(1)
CAN stop register (CSTOP)
The CSTOP register controls the clock supply of the FCAN system.
This register can be read/written in 8-bit and16-bit units.
Figure 14-8:
CAN Stop Register (CSTOP)
Note: The address of an interrupt pending register is calculated according to the following formula:
effective address = P address offset
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Offset
Note
Initial
value
CSTOP CSTP
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1000H
0000H
Bit Position
Bit Name
Function
15
CSTP
Controls the clock supply for the complete FCAN system. The CSTP flag can be used
to reduce the power consumption when the FCAN system is set to SLEEP mode and
STOP mode to a minimum.
0: FCAN system is supplied with clock f
MEM
.
1: Clock supply of the FCAN system is stopped.
Remark:
When switching off the clock supply of the FCAN system during SLEEP
mode, wake-up by CAN bus activity is possible. But, instead of CxINT4
interrupt (i.e. wake-up from SLEEP mode interrupt), the GINT3 interrupt
must be used.
Cautions: 1. In case CSTP is set (1), access to the register and buffer of the
FCAN system is impossible, except access to the CSTOP register.
2. Do not set CSTP = 1 while the FCAN system is under normal oper-
ation, especially while a CAN module handles messages on the
CAN bus. A sudden stop of the FCAN system might cause mal-
functions of the entire CAN network.
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