Z8F082A28100KIT ZILOG [Zilog, Inc.], Z8F082A28100KIT Datasheet - Page 106

• Manufacturer Part Number: Z8F082A28100KIT
• Description: Z8 Encore XP-R F08xA Series with eXtended Peripherals
• Manufacturer: ZILOG [Zilog, Inc.]

PS024705-0405
Receiving Data using the Polled Method
The UART is now configured for interrupt-driven data transmission. Because the UART
Transmit Data register is empty, an interrupt is generated immediately. When the UART
Transmit interrupt is detected, the associated interrupt service routine (ISR) performs the
following:
1. Write the UART Control 1 register to select the multiprocessor bit for the byte to be
2. Write the data byte to the UART Transmit Data register. The transmitter automatically
3. Clear the UART Transmit interrupt bit in the applicable Interrupt Request register.
4. Execute the IRET instruction to return from the interrupt-service routine and wait for
Follow these steps to configure the UART for polled data reception:
5. Write to the UART Baud Rate High and Low Byte registers to set an acceptable baud
6. Enable the UART pin functions by configuring the associated GPIO Port pins for
7. Write to the UART Control 1 register to enable MULTIPROCESSOR mode functions,
8. Write to the UART Control 0 register to:
9. Check the RDA bit in the UART Status 0 register to determine if the Receive Data
10. Read data from the UART Receive Data register. If operating in MULTIPROCESSOR
11. Return to Step 4 to receive additional data.
transmitted:
Set the Multiprocessor Bit Transmitter (MPBT) if sending an address byte, clear it if
sending a data byte.
transfers the data to the Transmit Shift register and transmits the data.
the Transmit Data register to again become empty.
rate for the incoming data stream.
alternate function operation.
if appropriate.
–
–
register contains a valid data byte (indicated by a 1). If RDA is set to 1 to indicate
available data, continue to Step 5. If the Receive Data register is empty (indicated by a
0), continue to monitor the RDA bit awaiting reception of the valid data.
(9-bit) mode, further actions may be required depending on the MULTIPROCESSOR
mode bits MPMD[1:0].
Set the receive enable bit (REN) to enable the UART for data reception
Enable parity, if appropriate and if Multiprocessor mode is not enabled, and select
either even or odd parity.
P R E L I M I N A R Y
Z8 Encore! XP
Product Specification
®
F08xA Seriess
UART
88