Datasheet
V850ES/JG3-H, V850ES/JH3-H CHAPTER 20 CAN CONTROLLER
R01UH0042EJ0500 Rev.5.00 Page 964 of 1513
Aug 12, 2011
(15) CAN0 module receive history list register (C0RGPT)
The C0RGPT register is used to read the receive history list.
(1/2)
After reset: xx02H R/W Address: 03FEC060H
(a) Read
15 14 13 12 11 10 9 8
C0RGPT RGPT7 RGPT6 RGPT5 RGPT4 RGPT3 RGPT2 RGPT1 RGPT0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 RHPM ROVF
(b) Write
15 14 13 12 11 10 9 8
C0RGPT 0 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0
Clear
ROVF
(a) Read
RGPT7 to RGPT0
Receive history list read pointer
0 to 31
When the C0RGPT register is read, the contents of the element indexed by the receive history list
get pointer (RGPT) of the receive history list are read. These contents indicate the number of the
message buffer in which a data frame or a remote frame has been stored.
RHPM
Note 1
Receive history list pointer match
0 The receive history list has at least one message buffer number that has not been read.
1 The receive history list has no message buffer numbers that have not been read.
ROVF
Note 2
Receive history list overflow bit
0
All the message buffer numbers that have not been read are preserved. All the numbers of the
message buffers in which a new data frame or remote frame has been received and stored are recorded
to the receive history list (the receive history list has a vacant element).
1
At least 23 entries have been stored since the host processor serviced the RHL last time (i.e. read
C0RGPT). The first 22 entries are sequentially stored whereas the last entry might have been
overwritten by newly received messages a number of times because all buffer numbers are stored at
position LIPT-1 when the ROVF bit is set to 1. As a consequence receptions cannot be completely
recovered in the order that they were received.
Notes 1. The read value of the RGPT0 to RGPT7 bits is invalid when the RHPM bit = 1.
2. If all the receive history is read by the C0RGPT register while the ROVF bit is set (1), the RHPM bit
is not cleared (0) but kept set (1) even if newly received data is stored.