HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 220

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

Table 5.14 MSCI Actions at Short Frame Detection
Frame Length
(excluding
flag)
Bits 1 8
Bits 9 23
Bits 24 31
Bits 32 39
Bits 40 or more Receives the data
Note: On detecting a short frame, the MSCI sets the SHRT bit of ST2 to 1. This automatically
Rev. 0, 07/98, page 204 of 453
sets the EOM bit to 1, indicating the end of a receive frame. At this time, an interrupt
request is generated (if enabled). Even if the MSCI detects a short frame, it does not set
the SHRT bit to 1, if data is not transferred to the receive buffer.
Address Field
No-Check Single
Address 1
Sends no data to
the receive buffer.
Sends a part of the
data to the receive
buffer.
Appends the short
frame status to the
last character and
sets the SHRT bit
of ST2.
Sends a part of the
data to the receive
buffer.
Appends the short
frame status to the
last character and
sets the SHRT bit
of ST2.
Receives the data
as normal data.
as normal data.
CRCCC Bit = 0
Single Address 2
Dual Address
Sends no data to the
receive buffer.
Sends a part of the
data to the receive
buffer.
Appends the short
frame status to the last
character and sets the
SHRT bit of ST2.
Sends a part of the
data to the receive
buffer.
Appends the short
frame status to the last
character and sets the
SHRT bit of ST2.
Sends a part of the
data to the receive
buffer.
Appends the short
frame status to the last
character and sets the
SHRT bit of ST2.
Receives the data as
normal data.
Mode Settings
Address Field
No-Check Single
Address 1
Sends no data to
the receive buffer.
Sends no data to
the receive buffer.
Sends a part of
the data to the
receive buffer.
Appends the short
frame status to
the last character
and sets the
SHRT bit of ST2.
Receives the data
as normal data.
Receives the data
as normal data.
CRCCC Bit = 1
Single Address 2
Dual Address
Sends no data to
the receive buffer.
Sends no data to
the receive buffer.
Sends a part of
the data to the
receive buffer.
Appends the short
frame status to the
last character and
sets the SHRT bit
of ST2.
Sends a part of
the data to the
receive buffer.
Appends the short
frame status to the
last character and
sets the SHRT bit
of ST2.
Receives the data
as normal data.