CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
286
(6) Transmit shift register (TXS0, TXS0L, TXS1, TXS1L)
TXSn are 9-bit shift registers for transmit processing. Writing of data to these registers starts a transmit
operation.
A transmission complete interrupt request (INTSTn) is generated in synchronization with termination of
transmission of 1 frame, which includes TXSn data.
During 16-bit access of these registers, specify TXS0 and TXS1, and during lower 8-bit access, specify TXS0L
and TXS1L.
(7) Adding transmit control parity
In accordance with the contents set in the ASIMn0 and ASIMn1 registers, start bits, parity bits, stop bits, etc.
are added to the data written to the TXSn or TXSnL register, and transmit operation control is carried out.
(8) Selector
This selects the serial clock source.
Figure 10-1. Block Diagram of Asynchronous Serial Interface
UART1
UART0
RXD1
RXD0
RXE0
TXD1
TXD0
SCK1
SCK0
1/16
TXS0/TXS0L
RXB0/RXB0L
Transmit
shift register
Receive shift
register
Receive
buffer
Receive
control
parity check
Transmit
control
parity added
1/16
BRG0
BRG1
1/2
SCLS01, SCLS00
INTST0
INTSER0
INTSR0
INTST1
INTSER1
INTSR1
Selector
Internal system
clock
( )
φ
Summary of Contents for V850E/MS1 UPD703100
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