MC68HC08AZ60 Datasheet, PDF (324/452 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
MSCAN Controller (MSCAN08)
CPU Wait Mode
The MSCAN08 module remains active during CPU wait mode. The
MSCAN08 will stay synchronized to the CAN bus and generates
transmit, receive, and error interrupts to the CPU, if enabled. Any such
interrupt will bring the MCU out of wait mode.
Programmable
Wakeup Function
The MSCAN08 can be programmed to apply a low-pass filter function to
the RxCAN input line while in internal sleep mode (see information on
control bit WUPM in MSCAN08 Module Control Register 1 on page
338). This feature can be used to protect the MSCAN08 from wake-up
due to short glitches on the CAN bus lines. Such glitches can result from
electromagnetic inference within noisy environments.
Timer Link
The MSCAN08 will generate a timer signal whenever a valid frame has
been received. Because the CAN specification defines a frame to be
valid if no errors occurred before the EOF field has been transmitted
successfully, the timer signal will be generated right after the EOF. A
pulse of one bit time is generated. As the MSCAN08 receiver engine
also receives the frames being sent by itself, a timer signal also will be
generated after a successful transmission.
The previously described timer signal can be routed into the on-chip
timer interface module (TIM).This signal is connected to the timer n
channel m input¹ under the control of the timer link enable (TLNKEN) bit
in the CMCR0.
After timer n has been programmed to capture rising edge events, it can
be used under software control to generate 16-bit time stamps which can
be stored with the received message.
1. The timer channel being used for the timer link is integration dependent.
MC68HC08AZ60 — Rev 1.0
324
MSCAN Controller (MSCAN08)
For More Information On This Product,
Go to: www.freescale.com
20-mscan
MOTOROLA