S912XEP100J5MAGR Freescale Semiconductor, S912XEP100J5MAGR Datasheet - Page 618

no-image

S912XEP100J5MAGR

Manufacturer Part Number
S912XEP100J5MAGR
Description
S912XEP Series 16 Bit 50 Mhz 1 MB Flash 64 KB Ram Microcontroller - LQFP-144
Manufacturer
Freescale Semiconductor
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
S912XEP100J5MAGR
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Chapter 16 Freescale’s Scalable Controller Area Network (S12MSCANV3)
16.3.2.4
The CANBTR1 register configures various CAN bus timing parameters of the MSCAN module.
1. Read: Anytime
1. In this case, PHASE_SEG1 must be at least 2 time quanta (Tq).
618
Module Base + 0x0003
TSEG2[2:0]
TSEG1[3:0]
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1)
SAMP
Field
6-4
3-0
7
Reset:
W
R
Sampling — This bit determines the number of CAN bus samples taken per bit time.
0 One sample per bit.
1 Three samples per bit
If SAMP = 0, the resulting bit value is equal to the value of the single bit positioned at the sample point. If
SAMP = 1, the resulting bit value is determined by using majority rule on the three total samples. For higher bit
rates, it is recommended that only one sample is taken per bit time (SAMP = 0).
Time Segment 2 — Time segments within the bit time fix the number of clock cycles per bit time and the location
of the sample point (see
Table
Time Segment 1 — Time segments within the bit time fix the number of clock cycles per bit time and the location
of the sample point (see
Table
MSCAN Bus Timing Register 1 (CANBTR1)
SAMP
0
7
16-9.
16-10.
BRP5
0
0
0
0
1
:
Figure 16-7. MSCAN Bus Timing Register 1 (CANBTR1)
TSEG22
BRP4
0
0
0
0
1
Table 16-8. CANBTR1 Register Field Descriptions
:
6
0
MC9S12XE-Family Reference Manual , Rev. 1.23
(1)
Figure
Figure
BRP3
.
0
0
0
0
1
:
Table 16-7. Baud Rate Prescaler
TSEG21
16-44). Time segment 2 (TSEG2) values are programmable as shown in
16-44). Time segment 1 (TSEG1) values are programmable as shown in
0
5
BRP2
0
0
0
0
1
:
TSEG20
BRP1
4
0
0
0
1
1
1
:
Description
BRP0
TSEG13
0
1
0
1
1
:
0
3
TSEG12
Prescaler value (P)
2
0
64
1
2
3
4
:
Access: User read/write
TSEG11
Freescale Semiconductor
0
1
TSEG10
0
0
(1)

Related parts for S912XEP100J5MAGR