am85c30 Advanced Micro Devices, am85c30 Datasheet - Page 20

• Manufacturer Part Number: am85c30
• Description: Enhanced Serial Communications Controller
• Manufacturer: Advanced Micro Devices

20
D
D
AMD
7
7
D
D
6
6
D
D
Read Register 12
Read Register 10
5
5
Reset Tx Underrun/EOM Latch
D
D
4
4
D
D
Reset Tx CRC Generator
3
3
Reset Rx CRC Checker
D
D
2
2
D
D
1
1
D
D
0
0
Null Code
Figure 8. Read Register Bit Functions (continued)
0
On Loop
0
0
Loop Sending
0
Two Clocks Missing
One Clock Missing
TC
TC
TC
TC
TC
TC
TC
TC
0
1
2
3
4
5
6
7
Figure 9. Write Register Bit Functions
Lower Byte of
Time Constant
D
0
0
1
1
7
D
0
1
0
1
Write Register 0
6
D
0
0
0
0
1
1
1
1
5
D
0
0
1
1
0
0
1
1
4
Am85C30
*Added Enhancement
D
D
0
1
0
1
0
1
0
1
3
7
D
Null Code
Point High Register Group
Reset Ext/Status Interrupts
Send Abort
Enable Int on Next Rx Character
Reset Tx Int Pending
Error Reset
Reset Highest IUS
D
0
0
0
0
1
1
1
1
2
6
D
D
D
0
0
1
1
0
0
1
1
Read Register 15
1
7
5
D
D
D
0
1
0
1
0
1
0
1
0
6
4
D
D
Read Register 13
5
3
0
1
2
3
4
5
6
7
Register
D
D
4
2
10
11
12
13
14
15
D
D
8
9
10216F-13
3
1
D
D
2
0
D
SDLC/HDLC Enhancement Status*
Zero Count IE
10
DCD IE
SYNC Hunt IE
CTS IE
Tx Underrun/EOM IE
Break/Abort IE
1
D
0
19 bit FIFO Enable/Disable*
TC
TC
TC
TC
TC
TC
TC
TC
8
9
10
11
12
13
14
15
Upper Byte of
Time Constant
10216F-12
(concluded)