Z8 Encore! XP
®
4K Series
Product Specification
101
TXD—Transmit Data
UART transmitter data byte to be shifted out through the TXDx pin.
UART Receive Data Register
Data bytes received through the RXDx pin are stored in the UART Receive Data
(UxRXD) register (Table
The read-only UART Receive Data register shares a Regis-
ter File address with the Write-only UART Transmit Data register.
Table 63. UART Receive Data Register (U0RXD)
BITS
FIELD
RESET
R/W
ADDR
X
R
X
R
X
R
X
R
F40H
7
6
5
4
RXD
X
R
X
R
X
R
X
R
3
2
1
0
RXD—Receive Data
UART receiver data byte from the RXDx pin
UART Status 0 Register
The UART Status 0 (UxSTAT0) and Status 1(UxSTAT1) registers (Tables
iden-
tify the current UART operating configuration and status.
Table 64. UART Status 0 Register (U0STAT0)
BITS
FIELD
RESET
R/W
ADDR
7
RDA
0
R
6
PE
0
R
5
OE
0
R
4
FE
0
R
F41H
3
BRKD
0
R
2
TDRE
1
R
1
TXE
1
R
0
CTS
X
R
RDA—Receive Data Available
This bit indicates that the UART Receive Data register has received data. Reading the
UART Receive Data register clears this bit.
0 = The UART Receive Data register is empty.
1 = There is a byte in the UART Receive Data register.
PE—Parity Error
This bit indicates that a parity error has occurred. Reading the UART Receive Data regis-
ter clears this bit.
PS022815-0206
UART
ZILOG [ ZILOG, INC. ]
