W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 159

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

Bits 0-7
pin (THR[7] first).
Interrupt Enable Register (IER)
Port address : 0xf00003f9, DLAB=0 (COM0)
Default : 0x0
Bit 4 MODEM Status Interrupt (Irpt_MOS) Enable
Bit 5 Receiver Line Status Interrupt (Irpt_RLS) Enable
Bits 6 Transmitter Holding Register Empty Interrupt (Irpt_THRE) Enable
Bits 7 Receiver Data Available Interrupt (Irpt_RDA) and Time-Out Interrupt
(Irpt_TOUT) Enable
Divisor Latch (low byte) Register (DLL)
Port address : 0xf00003f8, DLAB=1 (COM0)
Default : 0x0
W90221X version 0.6
0
0
Writing to this register, COM port will sent out the data through SDO
0 = Mask Irpt_MOS
1 = Enable Irpt_MOS
0 = Mask Irpt_RLS
1 = Enable Irpt_RLS
0 = Mask Irpt_THRE
1 = Enable Irpt_THRE
0 = Mask Irpt_RDA and Irpt_TOUT
1 = Enable Irpt_RDA and Irpt_TOUT
0xf00002f9, DLAB=0 (COM1)
0xf00002f8, DLAB=1 (COM1)
1
1
Transmit Data
2
2
3
3
MOS_Ie
4
n
4
RLS_Ie
Read/Write Power-on
Read/write
5
n
5
THRE_I
en
6
6
Power-on
RDA_Ie
7
n
7
- 159 -