C8051F50x-F51x
21. Local Interconnect Network (LIN)
Important Note: This chapter assumes an understanding of the Local Interconnect Network (LIN) proto-
col. For more information about the LIN protocol, including specifications, please refer to the LIN consor-
tium (http://www.lin-subbus.org).
LIN is an asynchronous, serial communications interface used primarily in automotive networks. The Sili-
con Laboratories LIN controller is compliant to the 2.1 Specification, implements a complete hardware LIN
interface and includes the following features:
Selectable Master and Slave modes.
Automatic baud rate option in slave mode.
The internal oscillator is accurate to within 0.5% of 24 MHz across the entire supply voltage and
temperature range and so an external oscillator is not necessary for master mode operation.
Note: The minimum system clock (SYSCLK) required when using the LIN controller is 8 MHz.
C8051F500/2/4/6
LIN Controller
8051 MCU Core
LIN0ADR
LIN Data
Registers
LIN Control
Registers
LIN0DAT
LIN0CF
Indirectly Addressed Registers
TX
RX
Control State Machine
Figure 21.1. LIN Block Diagram
The LIN controller has four main components:
LIN Access Registers—Provide the interface between the MCU core and the LIN controller.
LIN Data Registers—Where transmitted and received message data bytes are stored.
LIN Control Registers—Control the functionality of the LIN interface.
Control State Machine and Bit Streaming Logic—Contains the hardware that serializes messages and
controls the bus timing of the controller.
Rev. 1.1
201
SILICON [ SILICON ]
