Rev. 3.0, 03/01, page 146 of 390
(17) Tx Byte Count Low Register (ITBCLR)
Address: H'1000710C (Bank 1, Read/ Write)
Bit
7
6
5
4
3
2
1
0
Bit Name
TBC7
TBC6
TBC5
TBC4
TBC3
TBC2
TBC1
TBC0
Initial Value
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit
Description
Default
0 - 7
Tx Byte Count, D0 – D7:
Provide a running count (low-order value) of the number of bytes remaining to be
transmitted. Before enabling transmission, software loads this register with the low-order
byte length of the data packet. When the counter reaches zero, the transmitter ceases to
make DMA requests. Transmission continues until Tx FIFO is depleted.
Bit 7 6 5 4 3 2 1 0
Bit Name D7 D6 D5 D4 D3 D2 D1 D0
(18) Tx Byte Count High Register (ITBCHR)
Address: H'1000710E (Bank 1, Read/ Write)
Bit
7
6
5
4
3
2
1
0
Bit Name
-
-
-
TBC12
TBC11
TBC10
TBC9
TBC8
Initial Value
-
-
-
1
0
0
0
0
R/W
-
-
-
R/W
R/W
R/W
R/W
R/W
Bit
Description
Default
7 - 5
Reserved
-
4 - 0
Tx Byte Count, D8 - D12:
Specify the high-order byte length of the data packet to be transmitted. Refer to Tx Byte
Count Low Register.
Bit 7 6 5 4 3 2 1 0
Bit Name - - - D12 D11 D10 D9 D8
10000
Summary of Contents for HD64465
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