MC68HC05X16 Datasheet, PDF (79/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
Table 5-3 Time segment values
TSEG13
0
0
0
.
.
1
TSEG12
0
0
0
.
.
1
TSEG11
0
1
1
.
.
1
TSEG10
1
0
1
.
.
1
Time segment 1
2 t_SCL cycles
3 t_SCL cycles
4 t_SCL cycles
.
.
16 t_SCL cycles
TSEG22
0
.
.
1
TSEG21
0
.
.
1
TSEG20
1
.
.
1
Time segment 2
2 t_SCL cycles
.
.
8 t_SCL cycles
Calculation of the bit time
BIT_TIME = SYNC_SEG + TSEG1 + TSEG2
5
Note:
TSEG2 must be at least 2 t_SCL, i.e. the configuration bits must not be 000. (If three
samples per bit mode is selected then TSEG2 must be at least 3 t_SCL.)
TSEG1 must be at least as long as TSEG2.
The synchronization jump width (SJW) may not exceed TSEG2, and must be at least
t_SCL shorter than TSEG1 to allow for physical propagation delays.
i.e. in terms of t_SCL:
and
or
SYNC_SEG = 1
TSEG1 ≥ SJW + 1
TSEG1 ≥ TSEG2
TSEG2 ≥ SJW
TSEG2 ≥ 2
(SAMP = 0)
TSEG2 ≥ 3
(SAMP = 1)
These boundary conditions result in minimum bit times of 5 t_SCL, for one sample, and 7 t_SCL, for
three samples per bit.
MC68HC05X16
MOTOROLA CAN MODULE (MCAN)
For More Information On This Product,
5-17
Go to: www.freescale.com