Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 137

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

PS024604-1005
Receiving Data using the Polled Method
7. Execute an EI instruction to enable interrupts.
The LIN-UART is now configured for interrupt-driven data transmission. Because the
LIN-UART Transmit Data Register is empty, an interrupt is generated immediately. When
the LIN-UART Transmit interrupt is detected, and there is transmit data ready to send, the
associated interrupt service routine (ISR) performs the following:
1. If in MULTIPROCESSOR mode, write the LIN-UART Control 1 Register to select
2. Write the data byte to the LIN-UART Transmit Data Register. The transmitter auto-
3. Execute the IRET instruction to return from the interrupt-service routine and wait for
If a transmit interrupt occurs and there is no transmit data ready to send the interrupt-ser-
vice routine will execute the IRET instruction. When the application does have data to
transmit, software can set the appropriate interrupt request bit in the Interrupt Controller to
initiate a new transmit interrupt. Another alternative would be for software to write the
data to the Transmit Data Register instead of invoking the interrupt-service routine.
Follow these steps to configure the LIN-UART for polled data reception:
1. Write to the LIN-UART Baud Rate High and Low Byte registers to set the appropriate
2. Enable the LIN-UART pin functions by configuring the associated GPIO port pins for
3. Write to the LIN-UART Control 1 Register to enable MULTIPROCESSOR mode
4. Write to the LIN-UART Control 0 Register to:
5. Check the RDA bit in the LIN-UART Status 0 register to determine if the Receive Data
the outgoing address bit:
Set the Multiprocessor Bit Transmitter (MPBT) if sending an address byte, clear it if
sending a data byte.
matically transfers the data to the Transmit Shift register and transmits the data.
the Transmit Data Register to again become empty.
baud rate.
alternate function operation.
functions, if appropriate.
a. Set the receive enable bit (
b. If multiprocessor mode is not enabled, enable parity, if appropriate, and select
Register contains a valid data byte (indicated by a 1). If RDA is set to 1 to indicate
available data, continue to Step 6. If the Receive Data Register is empty (indicated by
a 0), continue to monitor the RDA bit awaiting reception of the valid data.
either even or odd parity.
P R E L I M I N A R Y
REN
) to enable the LIN-UART for data reception
Z8FMC16100 Series Flash MCU
Receiving Data using the Polled Method
Product Specification
115