RL78/F13, F14 CHAPTER 18 CAN INTERFACE (RS-CAN LITE)
R01UH0368EJ0210 Rev.2.10 1292
Dec 10, 2015
18.3.5 CANi Status Register L (CiSTSL) (i = 0)
Address C0STSLL: F0308H, C0STSLH: F0309H
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
— — — — — — — — COM
STS
REC
STS
TRM
STS
BO
STS
EP
STS
CSLP
STS
CHLT
STS
CRST
STS
After Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1
Bit Symbol Bit Name Description R/W
15 to 8 — Reserved These bits are always read as 0. R
7 COMSTS Communication Status Flag 0: Communication is not ready.
1: Communication is ready.
R
6 RECSTS Receive Status Flag 0: Bus idle, in transmission or bus off state
1: In reception
R
5 TRMSTS Transmit Status Flag 0: Bus idle or in reception
1: In transmission or bus off state
R
4 BOSTS Bus Off Status Flag 0: Not in bus off state
1: In bus off state
R
3 EPSTS Error Passive Status Flag 0: Not in error passive state
1: In error passive state
R
2 CSLPSTS Channel Stop Status Flag 0: Not in channel stop mode
1: In channel stop mode
R
1 CHLTSTS Channel Halt Status Flag 0: Not in channel halt mode
1: In channel halt mode
R
0 CRSTSTS Channel Reset Status Flag 0: Not in channel reset mode
1: In channel reset mode
R
• COMSTS Flag
This bit indicates that communication is ready.
This flag becomes 1 when the CAN module has detected 11 consecutive recessive bits after it has transitioned
from channel reset mode or channel halt mode to channel communication mode. This flag is cleared to 0 in
channel reset mode or channel halt mode.
• RECSTS Flag
This flag is set to 1 when reception has started, and is cleared to 0 when the bus has become idle or
transmission has started.
• TRMSTS Flag
This flag is set to 1 when transmission has started, and is cleared to 0 when the bus has become idle or
reception has started. This flag remains 1 in the bus off state.
• BOSTS Flag
This flag is set to 1 when the CAN module has entered the bus off state (TEC[7:0] value > 255), and is cleared
to 0 when the CAN module has exited the bus off state.
• EPSTS Flag
This flag is set to 1 when the CAN module has entered the error passive state (128 ≤ TEC[7:0] value ≤ 255 or
128 ≤ REC[7:0] value), and is cleared to 0 when the CAN module has exited the error passive state or has
entered channel reset mode.
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