R5F61525 RENESAS [Renesas Technology Corp], R5F61525 Datasheet - Page 512

• Manufacturer Part Number: R5F61525
• Description: 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 13 Controller Area Network (HCAN)
13.3.16 Unread Message Status Register (UMSR)
UMSR indicates that a received message which has not been read is overwritten by a new receive
message. In this case, the message which has not been read is lost.
Note:
Rev. 3.00 Mar. 14, 2006 Page 474 of 804
REJ09B0104-0300
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit
Bit Name
Initial Value
R/W
Bit
Bit Name
Initial Value
R/W
Note: *
*
Bit Name
UMSR7
UMSR6
UMSR5
UMSR4
UMSR3
UMSR2
UMSR1
UMSR0
UMSR15
UMSR14
UMSR13
UMSR12
UMSR11
UMSR10
UMSR9
UMSR8
Only 1 can be written to clear the flag.
Only 1 can be written to these bits, to clear the flags.
UMSR15
UMSR7
R/(W)*
R/(W)*
15
0
7
0
Initial
Value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
UMSR14
UMSR6
R/(W)*
R/(W)*
14
0
6
0
UMSR13
UMSR5
R/(W)*
R/(W)*
13
R/W
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
R/(W)*
0
5
0
UMSR12
UMSR4
R/(W)*
R/(W)*
12
Description
The received message has been overwritten by a
new message before being read.
[Setting condition]
•
[Clearing conditions]
•
0
4
0
When a new message is received before
RXPR is cleared
Writing 1
UMSR11
UMSR3
R/(W)*
R/(W)*
11
0
3
0
UMSR10
UMSR2
R/(W)*
R/(W)*
10
0
2
0
UMSR1
UMSR9
R/(W)*
R/(W)*
9
0
1
0
UMSR0
UMSR8
R/(W)*
R/(W)*
8
0
0
0