W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 59

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

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