HD64570F16 Renesas Electronics America, HD64570F16 Datasheet - Page 263
HD64570F16
Manufacturer Part Number
HD64570F16
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F16.pdf
(469 pages)
Specifications of HD64570F16
Applications
ISDN
Interface
Serial
Voltage - Supply
4.75 V ~ 5.25 V
Package / Case
88-QFP
Mounting Type
Surface Mount
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (max)
5.5V
Operating Temp Range
-20C to 75C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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This register must be set in DMA initial state. In single-block transfer mode, the byte counter
register (BCR) must not be 1 in CPU modes 0, 2, and 3, since data may be transferred in word
units. To transmit/receive only one byte of data, data must be directly written to or read from the
MSCI TX/RX buffer register (TRB), instead of using the on-chip DMAC.
The above restrictions do not apply to CPU mode 1.
After reset, the value of this register is undefined.
Chained-Block Transfer Mode: In this mode, BCR indicates the number of bytes remaining in
the buffer currently being accessed. When the BCR value becomes 0000H, read/write access to
the current buffer terminates, and the next buffer becomes available. At this time, the BCR value
is updated, either to the byte length stored in the descriptor data length for a memory-to-MSCI
transfer (transmission: buffer read), or to the value of the receive buffer length register (BFL) for
an MSCI-to-memory transfer (reception: buffer write).
The MPU cannot write to this register in this mode.
After reset, the value of this register is undefined.
6.2.7
The DMA status register (DSR), provided for each of channels 0, 1, 2, and 3, indicates the status
of a DMA transfer. This register also enables or disables each DMAC channel.
DMA Status Register (DSR)
Single-block transfer
mode
Chained-block
transfer mode
Figure 6.6 Byte Count Register
15
BCRH
H
8 7
Rev. 0, 07/98, page 247 of 453
BCRL
L
0
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