HD64570F16 Renesas Electronics America, HD64570F16 Datasheet - Page 262
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
Available stocks
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HD64570F16V
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6.2.5
One set of two 8-bit subregisters, serving as the receive buffer length register (BFL: BFLL,
BFLH), is provided for each of channels 0 and 2 (figure 6.5).
Single-Block Transfer Mode: In single-block transfer mode, these subregisters are not used.
Their contents have no effect on operation.
Chained-Block Transfer Mode: In chained-block transfer mode, these subregisters serve as the
receive buffer length register (BFL: BFLL, BFLH). This register specifies the buffer length in
memory in byte units only in MSCI-to-memory chained-block transfer mode.
This register must be set in DMA initial state. In chained-block transfer mode, the receive buffer
length register (BFL) must not be 1 in CPU modes 0, 2, and 3, since data may be transferred in
word units.
The above restrictions do not apply to CPU mode 1 or transmission operation.
After reset, the value of this register is undefined.
6.2.6
One set of two 8-bit subregisters, serving as the byte count register (BCR: BCRL, BCRH), is
provided for each of channels 0, 1, 2, and 3 (figure 6.6).
Single-Block Transfer Mode: In single-block transfer mode, BCR specifies the number of bytes
to be transferred (up to 64 Kbytes). The BCR value is decremented by 1 each time one byte of
data is transferred by the DMAC or decremented by 2 each time one word of data is transferred.
The transfer operation terminates when the value becomes 0000H. If 0000H is set as the initial
value, 64 Kbytes of data will be transferred.
Rev. 0, 07/98, page 246 of 453
Receive Buffer Length Register (BFL: BFLL, BFLH)
Byte Count Register (BCR: BCRL, BCRH)
Chained-
block trans-
fer mode
Single-block transfer
mode
Figure 6.5 Receive Buffer Length Register
Memory to
MSCI
MSCI to
memory
15
Not used
Not used
BFLH
H
8 7
Not used
Not used
BFLL
L
0
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