Fujitsu FR81S Manuale Utente
CHAPTER 41: CAN
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: CAN
FUJITSU SEMICONDUCTOR CONFIDENTIAL
27
4.2.7. CAN Prescaler Extension Register : BRPER
The bit configuration of the CAN prescaler extension register is shown.
Extends the prescaler used in the CAN controller by combining the prescaler set at the CAN bit timing.
CAN Prescaler Extension Register (upper byte): Address Base + 0C
H
(Access:
Byte, Half-word, Word)
bit15
bit14
bit13
bit12
bit11
bit10
bit9
bit8
Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
Initial value
0
0
0
0
0
0
0
0
Attribute R0,W0
R0,W0
R0,W0
R0,W0
R0,W0
R0,W0
R0,W0
R0,W0
CAN Prescaler Extension Register (lower byte): Address Base + 0D
H
(Access:
Byte, Half-word, Word)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Reserved Reserved Reserved Reserved
BRPE
Initial value
0
0
0
0
0
0
0
0
Attribute R0,W0
R0,W0
R0,W0
R0,W0
R/W
R/W
R/W
R/W
[bit15 to bit4] : Reserved bit
The read value is always "0". When writing to these bits, set "0".
[bit3 to bit0] BRPE : Baud rate prescaler extension bits
The baud rate prescaler can be extended up to 1023 by combining the BRP and BRPE bits of the CAN bit
timing register (BTR).
The {BRPE (MSB:4 bit), BRP (LSB:6 bit)} + 1 value is the prescaler of the CAN controller.
MB91520 Series
MN705-00010-1v0-E
1720