SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 140

• Manufacturer Part Number: SC2200
• Description: Thin Client On a Chip
• Manufacturer: NSC [National Semiconductor]

www.national.com
SuperI/O Module
4.8.2
Both SP1 and SP2 provide UART functionality. The generic
SP1 and SP2 support serial data communication with
remote peripheral device or modem using a wired inter-
face. The functional blocks can function as a standard
16450, 16550, or as an Extended UART.
4.8.2.1
Four register banks, each containing eight registers, control
UART operation. All registers use the same 8-byte address
space to indicate offsets 00h through 07h. The BSR regis-
ter selects the active bank and is common to all banks. See
Figure 4-18.
4.8.2.2
The tables in this subsection provide register and bit maps
for Banks 0 through 3.
1.
When bit 7 of this register is set to 1, bits [6:0] of BSR select the bank, as shown in Table 4-38.
Offset
00h
01h
02h
03h
04h
05h
06h
07h
UART Functionality (SP1 and SP2)
UART Mode Register Bank Overview
SP1 and SP2 Register and Bit Maps for UART
Functionality
Type
(Continued)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
W
W
Name
RXD. Receiver Data Port
TXD. Transmitter Data Port
IER. Interrupt Enable
EIR. Event Identification (Read Cycles)
FCR. FIFO Control (Write Cycles)
LCR
BSR
MCR. Modem/Mode Control
LSR. Link Status
MSR. Modem Status
SPR. Scratchpad
ASCR. Auxiliary Status and Control
Table 4-37. Bank 0 Register Map
1
1
. Line Control
.Bank Select
140
Offset 07h
Offset 06h
Offset 05h
Offset 04h
Offset 02h
Offset 01h
Offset 00h
LCR/BSR
Figure 4-18. UART Mode Register Bank
Bank 0
Bank 1
Bank 2
Bank 3
Architecture
16550 Banks
Throughout
All Banks
Common
Register
Revision 3.0