CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
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(a) Read
Bit Position
Bit Name
Function
7
MERR
This is the status flag that indicates an MAC error.
0: Error has not occurred after the MERR bit has been cleared.
1: Error occurred at least once after the MERR bit was cleared.
Caution An MAC error occurs when access to an invalid RAM address is attempted.
3
EFSD
Indicates shutdown request.
0: Shutdown disabled
1: Shutdown enabled
Caution Be sure to set the EFSD bit (to 1) before clearing the GOM bit (to 0) (needs
to be accessed twice). The EFSD bit will be cleared (to 0) automatically
when the CGST register is accessed again.
2
TSM
Indicates the operation status of the time stamp counter
Note
.
0: Time stamp counter is stopped
1: Time stamp counter is operating
Note
See
11.10 (17) CAN time stamp count register (CGTSC)
0
GOM
Indicates the status of the global operation mode.
0: Access to CAN module register
Note
is prohibited
1: Access to CAN module register
Note
is enabled
Note
Register starting with “C1”
Cautions 1. The GOM bit controls the memory access method by the MAC.
• When GOM bit = 0
• Access to the CAN module register is prohibited (if accessed, a
MAC error interrupt occurs).
• Read/write access to the temporary buffer is enabled.
• Access to the message buffer area is enabled.
• When GOM bit = 1
• Access to the CAN module register is enabled.
• Only read access to the temporary buffer is enabled (if a write
access is attempted, a MAC error interrupt occurs).
• Access to the message buffer area is enabled.
2. The GOM bit is cleared to 0 only when all the CAN modules are in the
initial status (when the ISTAT bit of the C1CTRL register = 1). If one of
the CAN modules is not in the initial status, the GOM bit remains set (1)
even if it is cleared to 0.
Содержание V850E/IA1 mPD703116
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