HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 160
HD64570
Manufacturer Part Number
HD64570
Description
Serial Communications Adaptor
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD64570.pdf
(469 pages)
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3. If enabled, an interrupt request is generated when the residual bit data is ready to be read.
However, in bit synchronous mode, the residual bit interrupt must be disabled because receive
status is usually read from the frame status register (FST).
Abort end frame reception operation: An abort end frame reception operation is shown in
figure 5.4. Abort end frame data is transferred from the receive shift register to the receive buffer,
and the abort end frame status is set in the status FIFO.
1. Part of the aborted data (data 3 in figure 5.4) is transferred from the receive shift register to the
receive buffer. (Data 4 and 5 in figure 5.4 are not transferred to the receive buffer.) At this time,
the bits other than this data are undefined. However, during abort frame reception in bit
synchronous mode, if a zero is inserted in the character immediately before the abort frame, the
preceding 17 bits of data will be discarded. As a result, the three bytes of data before the abort
frame are not received correctly.
2. The EOM and ABT bits of the status FIFO are set to 1.
3. If enabled, an interrupt request is generated when the last data in the frame is ready to be read.
However, in bit synchronous mode, the abort end frame interrupt must be disabled because receive
status is usually read from the frame status register (FST).
Rev. 0, 07/98, page 144 of 453
Figure 5.4 Abort End Frame Reception Operation (CRCCC = 1)
Abort (8)
Receive buffer FIFO
Empty
Data 1 (8)
Data 2 (8)
Data 5 (8)
Receive shift register
Status
Data 4 (8)
(
): Bit count
MSB
Receive buffer
Data 3 (6)
Data 3 (6)
Data 1 (8)
Data 2 (8)
LSB
EOM = 1
ABT = 1
Status
FIFO
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