HC05 Datasheet, PDF (87/232 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit

When a dominant level is detected on the MCAN bus, the MCAN is woken up and a wake-up
interrupt is generated.
Under normal operation the two MCAN bus lines are forced to complementary logic levels. The
level of one of the two wires can be disregarded and replaced by V_DD/2 by setting one of the control
bits, RX0 or RX1.
5.5.1 Sleep comparator reference
When the COMPSEL bit in the MCAN command register ($21) is cleared the sleep comparator
inputs are the same as for the active comparator. However, when the COMPSEL bit is set each
input is compared with V_DD/2 (VDDH – see Figure 5-6) to detect a dominant level. For further
details of the active comparator, the sleep comparator and VDDH, refer to Section 12.
5
MC68HC05X16
Rev. 1
MOTOROLA CAN MODULE (MCAN)
MOTOROLA
5-25