mc68hc08az60 Freescale Semiconductor, Inc, mc68hc08az60 Datasheet - Page 324

• Manufacturer Part Number: mc68hc08az60
• Description: M68hc08 Family Of 8-bit Microcontroller Units Mcus
• Manufacturer: Freescale Semiconductor, Inc

MSCAN Controller (MSCAN08)
CPU Wait Mode
Programmable
Wakeup Function
Timer Link
MC68HC08AZ60 — Rev 1.0
324
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.
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
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.
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 input
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.
Freescale Semiconductor, Inc.
For More Information On This Product,
MSCAN Controller (MSCAN08)
Go to: www.freescale.com
1
under the control of the timer link enable (TLNKEN) bit
MSCAN08 Module Control Register 1
MOTOROLA
on page
20-mscan