Z8F021ASH020SC datasheet(111/276 Pages) ZILOG

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PS022815-0206

UART

Z8 Encore! XP® 4K Series

Product Specification

6. Check the TDRE bit in the UART Status 0 register to determine if the Transmit Data

Data register becomes available to receive new data.

7. Write the UART Control 1 register to select the outgoing address bit.

8. Set the Multiprocessor Bit Transmitter (MPBT) if sending an address byte, clear it if

sending a data byte.

9. Write the data byte to the UART Transmit Data register. The transmitter automatically

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

10. Make any changes to the Multiprocessor Bit Transmitter (MPBT) value, if appropriate

and MULTIPROCESSOR mode is enabled,.

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

Transmitting Data using the Interrupt-Driven Method

The UART Transmitter interrupt indicates the availability of the Transmit Data register to

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

driven data transmission:

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

rate.

2. Enable the 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 UART Transmitter interrupt and

set the acceptable priority.

5. Write to the UART Control 1 register to enable MULTIPROCESSOR (9-bit) mode

functions, if MULTIPROCESSOR mode is appropriate.

6. Set the MULTIPROCESSOR Mode Select (MPEN) to Enable MULTIPROCESSOR

mode.

7. Write to the UART Control 0 register to:

–

Set the transmit enable bit (TEN) to enable the UART for data transmission

–

Enable parity, if appropriate and if MULTIPROCESSOR mode is not enabled, and

select either even or odd parity.

–

Set or clear CTSE to enable or disable control from the remote receiver using the

CTS pin.

8. Execute an EI instruction to enable interrupts.

Z8F021ASH020SC 数据表(PDF) 111 Page - Zilog, Inc.

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