ZUSBOPTSC01ZACG datasheet(119/282 Pages) ZILOG

119 / 282 page

PS022827-1212

P R E L I M I N A R Y

Operation

Z8 Encore! XP® F082A Series

Product Specification

102

–

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

using the CTS pin



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 automati-

cally 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. Observe the following 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

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