Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 129

• 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
Baud Rate
IR_TXD
UART’s
Clock
TXD
Transmitting IrDA Data
7-clock
delay
Endec, and passed to the UART. Communication is half-duplex, which means
simultaneous data transmission and reception is not allowed.
The baud rate is set by the UART’s Baud Rate Generator and supports IrDA standard baud
rates from 9600 baud to 115.2 kbaud. Higher baud rates are possible, but do not meet IrDA
specifications. The UART must be enabled to use the Infrared Endec. The Infrared Endec
data rate is calculated using the following equation:
The data to be transmitted using the infrared transceiver is first sent to the UART. The
UART’s transmit signal (TXD) and baud rate clock are used by the IrDA to generate the
modulation signal (IR_TXD) that drives the infrared transceiver. Each UART/Infrared
data bit is 16 clocks wide. If the data to be transmitted is 1, the IR_TXD signal remains
low for the full 16 clock period. If the data to be transmitted is 0, the transmitter first out-
puts a 7 clock low period, followed by a 3 clock high pulse. Finally, a 6 clock low pulse is
output to complete the full 16 clock data period.
sion. When the Infrared Endec is enabled, the UART’s TXD signal is internal to the
Z8 Encore! XP
TXD pin.
Start Bit = 0
16 clock
period
3 clock
Infrared Data Rate (bits/s)
pulse
Figure 17. Infrared Data Transmission
®
F082A Series products while the IR_TXD signal is output through the
Data Bit 0 = 1
=
-------------------------------------------------------------------------------- -
16
Data Bit 1 = 0
×
System Clock Frequency (Hz)
UART Baud Rate Divisor Value
Figure 17
Data Bit 2 = 1
Z8 Encore! XP
displays IrDA data transmis-
Product Specification
Infrared Encoder/Decoder
Data Bit 3 = 1
®
F082A Series
118