upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 612

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

CnLOPT LOPT7
(b) Write
(16) CAN module last out-pointer register (CnLOPT)
Remark:
612
LOPT7 to LOPT0
Clear ROVF
The CnLOPT register indicates the number of the message buffer to which a data frame or a
remote frame was transmitted last.
Figure 16-38: CAN Module Receive History List Register (CnRGPT) Format (2/2)
0.....31
0
1
7
The value read from the CnLOPT register is undefined if a data frame or remote frame 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 CnLOPT register is undefined.
Figure 16-39: CAN Module Last Out-Pointer Register (CnLOPT) Format
ROVF bit is not changed.
ROVF bit is cleared to 0.
LOPT6
6
When the CnLOPT 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.
LOPT5
5
Chapter 16 FCAN Controller
LOPT4
User’s Manual U16702EE3V2UD00
4
Last out-pointer of transmit history list (LOPT)
LOPT3
3
Setting of ROVF bit
LOPT2
2
LOPT1
1
LOPT0
0
see Table
Address R/W After reset
16-16
R
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