h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 601
h8s-2646
Manufacturer Part Number
h8s-2646
Description
Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2646.pdf
(1165 pages)
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The following formula is used to calculate the baud rate.
Example: With a 1 Mb/s baud rate and a 20 MHz input clock:
1-bit time
Legend:
SYNC_SEG: Segment for establishing synchronization of nodes on the CAN bus. (Normal
PRSEG:
PHSEG1:
PHSEG2:
Note: * The time quanta values of TSEG1 and TSEG2 become the value of TSEG + 1.
Bit rate =
Note: f
1 Mb/s =
Set Values
f
BRP = 0 (B'000000)
TSEG1 = 4 (B'0100)
TSEG2 = 3 (B'011)
CLK
SYNC_SEG
= 20 MHz
The BCR value is used in the BRP, TSEG1, and TSEG2.
1
bit edge transitions occur in this segment.)
Segment for compensating for physical delay between networks.
Buffer segment for correcting phase drift (positive). (This segment is extended
when synchronization (resynchronization) is established.)
Buffer segment for correcting phase drift (negative). (This segment is
shortened when synchronization (resynchronization) is established.)
CLK
= φ (system clock)
2 × (0 + 1) × (3 + 4 + 3)
Figure 15.6 Detailed Description of Timing within 1 Bit
2 × (BRP + 1) × (3 + TSEG1 + TSEG2)
20 MHz
1-bit time (8 to 25 time quanta)
PRSEG
TSEG1 (time segment 1) *
f
CLK
Actual Values
—
System clock × 2
5TQ
4TQ
2 to 16
PHSEG1
Section 15 Controller Area Network (HCAN)
Rev. 5.00 Sep 22, 2005 page 575 of 1136
(time segment 2) *
PHSEG2
TSEG2
2 to 8
REJ09B0257-0500
Quantum
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