AN2633 Freescale Semiconductor / Motorola, AN2633 Datasheet - Page 23

• Manufacturer Part Number: AN2633
• Description: LIN Drivers for SLIC Module on the MC68HC908QL4
• Manufacturer: Freescale Semiconductor / Motorola

Sleep Mode
Driver Performance — Timer, UART, and SLIC Compared
MOTOROLA
The LIN protocol includes a sleep mode, which reduces system power
consumption. A message with ID 0x3C and first data byte of 0x00 is used to
broadcast the Sleep Mode command. The API driver will respond to this sleep
mode message by setting the sleep flag (LINSleep). As stated before, the
method of putting the module in sleep mode is hardware/design dependent and
is therefore handled by the application code.
The following performance data compares various methods of implementing
LIN communications with different hardware and software options. All are
based on using the same basic application found in the LIN kits demonstration
software (modified to accommodate an 8-byte message). This data allows the
developer to balance cost, performance, and other MCU features for a specific
application.
One of the key advantages to the SLIC module is its ability to simplify user
application code.
implementations, along with the QY bit-banged driver using a timer channel
and an ESCI version. These numbers show the memory usage for the LIN kit
application.
BitERROR
ChecksumERROR
LIN Drivers for SLIC Module on the MC68HC908QL4
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Table 8
Table 7. Error Descriptions
Set if there is a bit error when sending
Set if there is a checksum error while receiving
shows the RAM and ROM usage of the various
Driver Performance — Timer, UART, and SLIC Compared
Description
AN2633/D
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