HD64570F Renesas Electronics America, HD64570F Datasheet - Page 182
HD64570F
Manufacturer Part Number
HD64570F
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F.pdf
(469 pages)
Specifications of HD64570F
Applications
ISDN
Interface
Serial
Voltage - Supply
4.5 V ~ 5.5 V
Package / Case
88-QFP
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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Table 5.9
Read Mode
Word write
Byte write
Table 5.10 TRB Write Operation in CPU Mode 1
Read Mode
Byte write
Table 5.11 TRB Write Operation in CPU Modes 2, 3
Read Mode
Word write
Byte write
Notes: 1. Because the empty data byte count in the transmit buffer is unknown to the user, extra
Rev. 0, 07/98, page 166 of 453
2. TRBH and TRBL are simultaneously accessed in word write mode, and either TRBH or
3. Empty bytes A and B are arranged in the order as shown in figures 5.9 (a) and (b). The
4. Data is lost except in built-in DMA transfer. Data in the transmit buffer is not lost, but
care must be taken in writing data to the transmit buffer using the MPU. Set the
TRC14 TRC10 bits of TX ready control register 1 (TRC1) to 1EH or less in CPU modes
0, 2, and 3 (1FH in CPU mode 1), and confirm that the TXRDY bit of status register 0
(ST0) is 1 before writing data to the transmit buffer. (Do not write data to the transmit
buffer when the TXRDY bit is 0.) However, this procedure is not necessary in built-in
DMA transfer.
TRBL is accessed in byte write mode.
transmit buffer sends A and B to the serial unit in that order.
writing data to the full buffer does not guarantee subsequent operation.
TRB Write Operation in CPU Mode 0
Accessed Register*
TRBH
TRBL
TRBH
TRBL
Accessed Register*
TRBH
TRBL
Accessed Register*
TRBH
TRBL
TRBH
TRBL
2
2
2
2 or More Bytes
B*
A*
A*
A*
2 or More Bytes
A*
A*
2 or More Bytes
A*
B*
A*
A*
3
3
3
3
3
3
3
3
3
3
Empty Data Byte Count in Transmit Buffer*
Empty Data Byte Count in Transmit Buffer*
Empty Data Byte Count in Transmit Buffer*
1 Byte
A*
A*
1 Byte
A*
A*
1 Byte
A*
A*
*
*
*
*
3
3
3
3
3
3
4
4
4
4
None
None
None
*
*
*
*
*
*
*
*
*
*
4
4
4
4
4
4
4
4
4
4
1
1
1
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