Z8F6421PM020SC Datasheet, PDF (130/299 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers Z8 Encore-R 64K Series

Z8 Encore!^® 64K Series
Product Specification
110
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 register
(Table 52). The Read-only UART Receive Data register shares a Register File address
with the Write-only UART Transmit Data register.
Table 52. UART Receive Data Register (UxRXD)
BITS
7
6
5
4
3
2
1
0
FIELD
RXD
RESET
X
R/W
ADDR
R
F40H and F48H
RXD—Receive Data
UART receiver data byte from the RXDx pin
UART Status 0 Register
The UART Status 0 and Status 1 registers (Table 53 and 54) identify the current UART
operating configuration and status.
Table 53. UART Status 0 Register (UxSTAT0)
BITS
7
6
5
4
3
2
1
0
FIELD ^RDA
PE
OE
FE
BRKD TDRE
TXE
CTS
RESET
0
1
X
R/W
R
ADDR
F41H and F49H
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.
PS019915-1005
UART