HD64570 Datasheet, PDF (144/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Table 5.1 Transmit Commands (cont)
Command Name
(Set Value)
Function
End-of-message (06H) Specifies the transmit character, which is first transferred to the transmit
buffer after this command is issued, as the last character of the frame.
When the transmit character transmitted is a word, this command specifies
the transmit character written to D15−D8 as the last character of the frame
in CPU mode 0, and also specifies the transmit character written to D7−D0
as such in CPU modes 2 and 3.
Allows the transmitter to send the character marked with the end-of-
message attribute, transmit the CRC code in byte synchronous mode, or
sequentially transmit the FCS (CRC code) and flag in bit synchronous
mode.
Abort transmission
(07H)
Immediately transmits an 8-bit abort pattern 11111111 and clears the
transmit buffer.
This command is used in bit synchronous mode.
MP bit on (08H)
Sets the transmit data MP bit to 1, and then transmits a character. This
command is valid only for the first character transferred to the transmit
buffer after this command is issued. For details, see Multiprocessor
Support, in section 5.3.1.
This command operation is not guaranteed in modes other than
asynchronous mode.
TX buffer clear (09H) Clears the transmit buffer, deleting buffer contents.
No other register is affected.
Table 5.2 Receive Commands
Command Name
(Set Value)
RX reset (11H)
Function
Halts the receive shift register and sets the receiver to RX disable state;
clears the receive buffer and receive status in status registers 3−0 (ST3−
ST0).
No other register is affected.
Rev. 0, 07/98, page 128 of 453