Rainbow-electronics ATmega64C1 Manual de usuario descargar pdf (Pagina 210)

210

7647A–AVR–02/08

ATmega32/64/M1/C1

17.5 LIN / UART Description

17.5.1 Reset

The AVR core reset logic signal also resets the LIN/UART controller. Another form of reset

exists, a software reset controlled by LSWRES bit in LINCR register. This self-reset bit performs

a partial reset as shown in Table 17-2.

17.5.2 Clock

The I/O clock signal (clk

i/o

) also clocks the LIN/UART controller. It is its unique clock.

17.5.3 LIN Protocol Selection

LIN13 bit in LINCR register is used to select the LIN protocol:

• LIN13 = 0 (default): LIN 2.1 protocol,

• LIN13 = 1: LIN 1.3 protocol.

The controller checks the LIN13 bit in computing the checksum (enhanced checksum in LIN2.1 /

classic checksum in LIN 1.3). See “Rx & TX Response Functions” on page 208.

This bit is irrelevant for UART commands.

17.5.4 Configuration

Depending on the mode (LIN or UART), LCONF[1..0] bits of the LINCR register set the controller

in the following configuration (Table 17-3):

Table 17-2. Reset of LIN/UART Registers

LIN Control Reg. LINCR

0000 0000

x=unknown

u=unchanged

LIN Status & Interrupt Reg. LINSIR

0000 0000

LIN Enable Interrupt Reg. LINENIR

0000 0000

xxxx 0000

LIN Error Reg. LINERR

0000 0000

LIN Bit Timing Reg. LINBTR

0010 0000

LIN Baud Rate Reg. Low LINBRRL

0000 0000

uuuu uuuu

LIN Baud Rate Reg. High LINBRRH

0000 0000

xxxx uuuu

LIN Data Length Reg. LINDLR

0000 0000

LIN Identifier Reg. LINIDR

1000 0000

LIN Data Buffer Selection LINSEL

0000 0000

xxxx 0000

LIN Data LINDAT

0000 0000

Table 17-3. Configuration Table versus Mode

Mode LCONF[1..0] Configuration

LIN

LIN standard configuration (default)

No CRC field detection or transmission

Frame_Time_Out disable

Listening mode

UART

8-bit data, no parity & 1 stop-bit

8-bit data, even parity & 1 stop-bit

8-bit data, odd parity & 1 stop-bit

Listening mode, 8-bit data, no parity & 1 stop-bit

1 2 ... 205 206 207 208 209 210 211 212 213 214 215 ... 365 366

Rainbow-electronics ATmega64C1 Manual de usuario Pagina 210

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Rainbow-electronics ATmega64C1 Manual de usuario Pagina 210

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