ZUSBOPTSC01ZAC datasheet(136/402 Pages) ZILOG

136 / 402 page

LIN-UART

P R E L I M I N A R Y

PS024604-1005

Z8 Encore!® Motor Control Flash MCUs

Product Specification

114

5. Check the TDRE bit in the LIN-UART Status 0 register to determine if the Transmit

Data Register is empty (indicated by a 1). If empty, continue to Step 6. If the Transmit

Data Register is full (indicated by a 0), continue to monitor the TDRE bit until the

Transmit Data Register becomes available to receive new data.

6. If in MULTIPROCESSOR mode, write the LIN-UART Control 1 Register to select

the outgoing address bit.

Set the Multiprocessor Bit Transmitter (MPBT) if sending an address byte; clear it if

sending a data byte.

7. Write the data byte to the LIN-UART Transmit Data Register. The transmitter auto-

matically transfers the data to the Transmit Shift register and transmits the data.

8. If appropriate, and if MULTIPROCESSOR mode is enabled, make any changes to the

Multiprocessor Bit Transmitter (MPBT) value.

9. To transmit additional bytes, return to Step 5.

Transmitting Data using the Interrupt-Driven Method

The LIN-UART Transmitter interrupt indicates the availability of the Transmit Data Reg-

ister to accept new data for transmission. Follow these steps to configure the LIN-UART

for interrupt-driven data transmission:

1. Write to the LIN-UART Baud Rate High and Low Byte registers to set the appropriate

baud rate.

2. Enable the LIN-UART pin functions by configuring the associated GPIO port pins for

alternate function operation.

3. Execute a DI instruction to disable interrupts.

4. Write to the Interrupt control registers to enable the LIN-UART Transmitter interrupt

and set the appropriate priority.

5. If multiprocessor mode is appropriate, write to the LIN-UART Control 1 Register to

enable Multiprocessor (9-bit) mode functions.

Set the MULTIPROCESSOR Mode Select (MPEN) to Enable MULTIPROCESSOR

mode.

6. Write to the LIN-UART Control 0 Register to:

a. Set the transmit enable bit (TEN) to enable the LIN-UART for data transmission

b. If multiprocessor mode is not enabled, enable parity, if appropriate, and select

either even or odd parity.

c. Set or clear the CTSE bit to enable or disable control from the remote receiver via

the CTS pin.

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