H8S2639 Datasheet, PDF (721/1547 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 16 Controller Area Network (HCAN)
16.3.5 HCAN Sleep Mode
The HCAN is provided with an HCAN sleep mode that places the HCAN module in the sleep
state to reduce current dissipation. Figure 16-11 shows a flowchart of the HCAN sleep mode.
MCR5 = 1
No
Bus idle?
Yes
Initialize TEC and REC
No
Bus operation?
Yes
IRR12 = 1
No
IMR12 = 1?
Yes
CPU interrupt
Sleep mode clearing method
MCR7 = 0?
No (automatic)
Yes (manual)
No
Clear sleep mode?
Yes
No
GSR3 = 1?
Yes
MCR5 = 0
No
GSR3 = 1?
Yes
MCR5 = 0
MB should
not be
accessed
No
11 recessive bits?
Yes
CAN bus communication possible
: Settings by user
: Processing by hardware
Figure 16-11 HCAN Sleep Mode Flowchart
Rev. 6.00 Feb 22, 2005 page 661 of 1484
REJ09B0103-0600