Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 112

• Manufacturer Part Number: Z8F042AHJ020SC00TR
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SC00TR

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 23
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Z8F042AHJ020SC00T

PS022825-0908
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. Set the Multiprocessor Bit Transmitter (MPBT) if sending an address byte, clear it if
3. Write the data byte to the UART Transmit Data register. The transmitter automatically
4. Clear the UART Transmit interrupt bit in the applicable Interrupt Request register.
5. Execute the IRET instruction to return from the interrupt-service routine and wait for
Follow the steps below to configure the UART for polled data reception:
1. Write to the UART Baud Rate High and Low Byte registers to set an acceptable baud
2. Enable the UART pin functions by configuring the associated GPIO Port pins for
3. Write to the UART Control 1 register to enable MULTIPROCESSOR mode functions,
4. Write to the UART Control 0 register to:
5. Check the RDA bit in the UART Status 0 register to determine if the Receive Data
6. Read data from the UART Receive Data register. If operating in MULTIPROCESSOR
7. Return to
transmitted:
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
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.
Step 4
to receive additional data.
Step
5. If the Receive Data register is empty (indicated by a
Universal Asynchronous Receiver/Transmitter
Z8 Encore! XP
Product Specification
®
F082A Series
101