CD2481 Datasheet, PDF (191/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

Programmable Four-Channel Communications Controller — CD2481
9.6.5.5
A Buffer Transmit Byte Count (ATBCNT)
Register Name: ATBCNT
Register Description: Transmit Buffer ‘A’ Byte Count
Default Value: x’0000
Access: Word Read/Write
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Binary Count Value, 16-bit Count bits 15 - 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Binary Count Value, 16-bit Count, bits 7 - 0
Intel Hex Address: x’58
Motorola Hex Address: x’5A
Bit 9
Bit 8
Bit 1
Bit 0
9.6.5.6
B Buffer Transmit Byte Count (BTBCNT)
Register Name: BTBCNT
Register Description: Transmit Buffer ‘B’ Byte Count
Default Value: x’0000
Access: Word Read/Write
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Binary Count Value, 16-bit Count, bits 15 - 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Binary Count Value, 16-bit Count bits 7 - 0
Intel Hex Address: x’5A
Motorola Hex Address: x’58
Bit 9
Bit 8
Bit 1
Bit 0
9.6.5.7
These registers contain the count of the bytes in the buffers to be transmitted.
A Transmit Buffer Status (ATBSTS) –Async Mode
Register Name: ATBSTS
Register Description: Transmit Buffer ‘A’ Status Register
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Berr
EOF
EOB
0
Bit 3
Append
Intel Hex Address: x’5C
Motorola Hex Address: x’5F
Bit 2
0
Bit 1
INTR
Bit 0
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Datasheet
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