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Z51F6412
Product Specification
PS030302-0212
P R E L I M I N A R Y
108
RXE
Enables the receiver unit.
0
Receiver is disabled
1
Receiver is enabled
USARTEN
Activate USART module by supplying clock.
0
USART is disabled (clock is halted)
1
USART is enabled
U2X
This bit only has effect for the asynchronous operation and selects
receiver sampling rate.
0 Normal
asynchronous
operation
1
Double Speed asynchronous operation
UCTRLx3 (USART Control 3 Register) : E4H, FCH, 2F2AH, 2F32H
,7
6
5
4
3
2
1
0
MASTER
LOOPS
DISXCK
SPISS
-
USBS
TX8
RX8
R/W
R/W
R/W
R/W
-
R/W
R/W
R/W
Initial value : 00H
MASTER
Selects master or slave in SPI or Synchronous mode operation and
controls the direction of XCK pin.
0
Slave mode operation and XCK is input pin.
1
Master mode operation and XCK is output pin
LOOPS
Controls the Loop Back mode of USART, for test mode
0 Normal
operation
1 Loop
Back
mode
DISXCK
In Synchronous mode of operation, selects the waveform of XCK
output.
0
XCK is free-running while USART is enabled in synchronous
master mode.
1
XCK is active while any frame is on transferring.
SPISS
Controls the functionality of SS pin in master SPI mode.
0
SS pin is normal GPIO or other primary function
1
SS output to other slave device
USBS
Selects the length of stop bit in Asynchronous or Synchronous mode of
operation.
0 1
Stop
Bit
1 2
Stop
Bit
TX8
The ninth bit of data frame in Asynchronous or Synchronous mode of
operation. Write this bit first before loading the UDATA register.
0 MSB
(9
th
bit) to be transmitted is ‘0’
1 MSB
(9
th
bit) to be transmitted is ‘1’
RX8
The ninth bit of data frame in Asynchronous or Synchronous mode of
operation. Read this bit first before reading the receive buffer.
0 MSB
(9
th
bit) received is ‘0’
1 MSB
(9
th
bit) received is ‘1’
USTATx (USART Status Register) : E5H, FDH, 2F2BH, 2F33H
7
6
5
4
3
2
1
0
UDRE
TXC
RXC
WAKE
SOFTRST
DOR
FE
PE
R/W
R/W
R/W
R/W
R/W
R
R
R
Initial value : 80H