Z8 Encore!® 64K Series
Product Specification
99
Parity Checker
Receive Shifter
Receiver Control
with address compare
RXD
Receive Data
Register
Control Registers
System Bus
Transmit Data
Status Register
Baud Rate
Generator
Register
Transmit Shift
Register
TXD
Transmitter Control
Parity Generator
CTS
DE
Figure 13. UART Block Diagram
Operation
Data Format
The UART always transmits and receives data in an 8-bit data format, least-significant bit
first. An even or odd parity bit can be optionally added to the data stream. Each character
begins with an active Low Start bit and ends with either 1 or 2 active High Stop bits.
Figures 14 and 15 illustrates the asynchronous data format employed by the UART with-
out parity and with parity, respectively.
PS019915-1005
UART
ZILOG [ ZILOG, INC. ]
