UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 591

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(b) Write
(16) CAN module last out-pointer register (C0LOPT)
Remark The value read from the C0LOPT register is undefined if a data frame or remote frame
The C0LOPT register indicates the number of the message buffer to which a data frame or a remote frame
was transmitted last.
After reset: Undefined
LOPT7-LOPT0
Clear ROVF
C0LOPT
0 to 15
0
1
has never been transmitted from a message buffer. If the THPM bit is set to 1 after the
CAN module has changed from the initialization mode to an operation mode, therefore,
the read value of the C0LOPT register is undefined.
LOPT7
ROVF bit is not changed.
ROVF bit is cleared to 0.
7
When the C0LOPT register is read, the contents of the element indexed by the last out-
pointer (LOPT) of the receive history list are read. These contents indicate the number
of the message buffer to which a data frame or a remote frame was transmitted last.
R
LOPT6
6
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 15 CAN CONTROLLER
Address: FF42H
LOPT5
Last Out-Pointer of Transmit History List (LOPT)
5
LOPT4
4
Setting of ROVF Bit
LOPT3
3
LOPT2
2
LOPT1
1
LOPT0
0
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