W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 59
W90220F
Manufacturer Part Number
W90220F
Description
Pa-risc Embedded Controller
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W90220F.pdf
(79 pages)
- Current page: 59 of 79
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The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
59
Bits 7
Divisor Latch (low byte) Register (DLL)
Port address : 0xf00003f8, DLAB=1 (COM1)
Bit 0-7 Low byte of baud rate dvisor
Divisor Latch (high byte) Register (DLM)
Port address : 0xf00003f9, DLAB=1 (COM1)
Bit 0-7 High byte of baud rate dvisor
The 16-bit Divisor ({DLM, DLL}) is used to determine the COM port's baud rate. The equation
is
Interrupt Identification Register (IIR)
Port address : 0xf00003fa (COM1)
0
0
Receiver Data Available Interrupt (Irpt_RDA) and Time-Out Interrupt (Irpt_TOUT) Enable
0 = Mask Irpt_THRE
1 = Enable Irpt_THRE
0 = Mask Irpt_RDA and Irpt_TOUT
1 = Enable Irpt_RDA and Irpt_TOUT
0xf00002f8, DLAB=1 (COM2)
0xf00002f9, DLAB=1 (COM2)
1
1
Baud Rate = Frequency input / {16 * [Divisor +2]}
2
2
Baud Rate Divisor (High Byte)
Baud Rate Divisor (Low Byte)
3
3
Read only
4
4
Read/write
Read/write
Power-on Default : ---
5
5
Power-on Default : 0x0
Power-on Default : 0x0
6
6
7
7
W90220F
Version 0.84
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