CD2481
—
Programmable Four-Channel Communications Controller
186
Datasheet
9.6.4.5
A Buffer Receive Byte Count (ARBCNT)
9.6.4.6
B Buffer Receive Byte Count (BRBCNT)
These registers contain the number of bytes stored in the external data buffers by the CD2481. The
count is updated after a block of data is moved to memory and when the buffer is terminated. As
initially written by the host, the register contains the number of bytes the buffer can hold.
9.6.4.7
A Receive Buffer Status (ARBSTS)
Register Name: ARBCNT
Register Description: Receive Buffer
‘
A
’
Byte Count
Default Value: x
’
0000
Access: Word Read/Write
Intel Hex Address: x
’
48
Motorola Hex Address: x
’
4A
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Binary Count Value, 16-bit Count bits 15 - 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Binary Count Value, 16-bit Count, bits 7 - 0
Register Name: BRBCNT
Register Description: Receive Buffer
‘
B
’
Byte Count
Default Value: x
’
0000
Access: Word Read/Write
Intel Hex Address: x
’
4A
Motorola Hex Address: x
’
48
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
Binary Count Value, 16-bit Count, bits 15 - 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Binary Count Value, 16-bit Count bits 7 - 0
Register Name: ARBSTS
Register Description: Receive Buffer
‘
A
’
Status
Default Value: x
’
00
Access: Byte Read/Write
Intel Hex Address: x
’
4C
Motorola Hex Address: x
’
4F
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Berr
EOF
EOB
0
0
0
0
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