HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 189
HD64570
Manufacturer Part Number
HD64570
Description
Serial Communications Adaptor
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD64570.pdf
(469 pages)
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Bits 7 2: Indicate the status of the data in the second stage of the receive buffer. These bits are
arranged in the same way as bits 7 2 of status register 2 (ST2). When data is in the second stage
of the receive buffer, the status of the second stage of the status FIFO is set to these bits. The
status is activated when the TX/RX buffer register (TRB) is ready to be read. When data is read
from TRB, the status of the data is cleared and replaced by the status of the following data. When
there is no subsequent data, the status remains cleared.
Bit 1: Reserved. This bit always reads 0 and must be set to 0.
Bit 0 (CDE1: Current Data 1): Indicates that data is in the second stage of the receive buffer.
This bit is set to 1 when TRB is ready to be read, and is cleared when data has been read with no
subsequent data.
CDE1 = 0:
CDE1 = 1:
This register and current status register 0 (CST0) are used by the MPU for interrupt processing and
receive buffer access. For details, see section 5.2.25, MSCI Current Status Register 0 (CST0).
Indicates that no data is in the second stage of the receive buffer
Indicates that data is in the second stage of the receive buffer
Rev. 0, 07/98, page 173 of 453
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