XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 398

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

MSCAN Controller (MSCAN08)
23.9.4 CPU Wait Mode
23.9.5 Programmable Wakeup Function
23.10 Timer Link
Technical Data
398
synchronisation is achieved the MSCAN08 will not respond to incoming
data.
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
413). 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
bit in the CMCR0.
1. The timer channel being used for the timer link is integration dependent.
MSCAN Controller (MSCAN08)
(1)
under the control of the timer link enable (TLNKEN)
MSCAN08 Module Control Register 1
MC68HC908AZ60A — Rev 2.0
MOTOROLA
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