MC9S08DZ96F2CLL datasheet(262/458 Pages) FREESCALE

262 / 458 page

Chapter 12 Freescale’s Controller Area Network (S08MSCANV1)

MC9S08DZ128 Series Data Sheet, Rev. 1

262

Freescale Semiconductor

12.3.4

MSCAN Bus Timing Register 1 (CANBTR1)

The CANBTR1 register conﬁgures various CAN bus timing parameters of the MSCAN module.

Read: Anytime

Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1)

Table 12-5. Baud Rate Prescaler

BRP5

BRP4

BRP3

BRP2

BRP1

BRP0

Prescaler value (P)

000000

000001

000010

000011

::::::

111111

76543210

SAMP

TSEG22

TSEG21

TSEG20

TSEG13

TSEG12

TSEG11

TSEG10

Reset:

00000000

Figure 12-7. MSCAN Bus Timing Register 1 (CANBTR1)

Table 12-6. CANBTR1 Register Field Descriptions

Field

Description

SAMP

Sampling — This bit determines the number of CAN bus samples taken per bit time.

0 One sample per bit.

1 Three samples per bit1.

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).

1 In this case, PHASE_SEG1 must be at least 2 time quanta (Tq).

6:4

TSEG2[2:0]

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 Figure 12-43). Time segment 2 (TSEG2) values are programmable as shown in

Table 12-7.

3:0

TSEG1[3:0]

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 Figure 12-43). Time segment 1 (TSEG1) values are programmable as shown in

Table 12-8.

MC9S08DZ96F2CLL bảng dữ liệu(PDF) 262 Page - Freescale Semiconductor, Inc

MC9S08DZ96F2CLL bảng dữ liệu(HTML) 262 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL