Z8F042AHJ020SG Zilog, Z8F042AHJ020SG Datasheet - Page 112

• Manufacturer Part Number: Z8F042AHJ020SG
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SG

• 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: Lead free / RoHS Compliant
• Other names: 269-4159; Z8F042AHJ020SG

PS022517-0508
UART Baud Rate Generator
The UART Baud Rate Generator creates a lower frequency baud rate clock for data
transmission. The input to the BRG is the system clock. The UART Baud Rate High and
Low Byte Registers combine to create a 16-bit baud rate divisor value (BRG[15:0]) that
sets the data transmission rate (baud rate) of the UART. The UART data rate is calculated
using the following equation:
UART Data Rate (bits/s)
Figure 16. UART Receiver Interrupt Service Routine Flow
Read Data
=
---------------------------------------------------------------------------------------------
16xUART Baud Rate Divisor Value
No
System Clock Frequency (Hz)
clears RDA bit and
Read Data which
resets error bits
Discard Data
Read Status
Receiver
Receiver
Interrupt
Ready
Errors?
Yes
Universal Asynchronous Receiver/Transmitter
Z8 Encore! XP
Product Specification
®
F0822 Series
99