CAN 2.0B Controller Module
MPC561/MPC563 Reference Manual, Rev. 1.2
16-30
Freescale Semiconductor
16.7.7
Control Register 2 (CANCTRL2)
Table 16-17. PRESDIV Bit Descriptions
Bits
Name
Description
0:7
PRESDIV
Prescaler divide factor. PRESDIV determines the ratio between the system clock frequency
and the serial clock (S-clock). The S-clock is determined by the following calculation:
Eqn. 16-1
The reset value of PRESDIV is 0x00, which forces the S-clock to default to the same
frequency as the system clock. The valid programmed values are 0 through 255.
8:15
CANCTRL2
See
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
PRESDIV
RJW
PSEG1
PSEG2
SRESET
0000_0000_0000_0000
Addr
0x30 7088 (CANCTRL2_A); 0x30 7488 (CANCTRL2_B); 0x30 7888 (CANCTRL2_C)
Figure 16-14. Control Register 2 (CANCTRL2)
Table 16-18. CANCTRL2 Bit Descriptions
Bits
Name
Description
0:7
PRESDIV
See
8:9
RJW
Resynchronization jump width. The RJW field defines the maximum number of time quanta
a bit time may be changed during resynchronization. The valid programmed values are zero
through three.
The resynchronization jump width is calculated as follows:
Resynchronizaton Jump Width = (RJW + 1) Time Quanta
10:12
PSEG1
PSEG1[2:0] — Phase buffer segment 1. The PSEG1 field defines the length of phase buffer
segment one in the bit time. The valid programmed values are zero through seven.
The length of phase buffer segment 1 is calculated as follows:
Phase Buffer Segment 1 = (PSEG1 + 1) Time Quanta
13:15
PSEG2
PSEG2 — Phase Buffer Segment 2. The PSEG2 field defines the length of phase buffer
segment two in the bit time. The valid programmed values are zero through seven.
The length of phase buffer segment two is calculated as follows:
Phase Buffer Segment 2 = (PSEG2 + 1) Time Quanta
S-clock
f
SYS
PRESDIV
1
+
------------------------------------
=
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...