SC2200 NSC [National Semiconductor], SC2200 Datasheet - Page 111

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

Revision 3.0
SuperI/O Module
4.4.2.4
Serial Ports 1 and 2 are identical, except for their reset val-
ues.
Serial Port 1 is designated as LDN 03h and Serial Port 2 as
LDN 08h. Table 4-11 lists the configuration registers which
Index F0h
Index
30h
60h
61h
70h
71h
74h
75h
F0h
6:3
Bit
7
2
1
0
LDN 03h and 08h - Serial Ports 1 and 2
Description
Bank Select Enable. Enables bank switching for Serial Ports 1 and 2.
0: Disabled. (Default)
1: Enabled.
Reserved.
Busy Indicator. (RO) This bit can be used by power management software to decide when to power-down Serial Ports 1
and 2 logical devices.
0: No transfer in progress. (Default)
1: Transfer in progress.
Power Mode Control. When the logical device is active in:
0: Low power mode - Serial Ports 1 and 2 Clock disabled. The output signals are set to their default states. Registers are
1: Normal power mode - Serial Ports 1 and 2 clock enabled. Serial Ports 1 and 2 are functional when the respective logical
TRI-STATE Control. This bit controls the TRI-STATE status of the device output pins when it is inactive (disabled).
0: Disabled. (Default)
1: Enabled when device inactive.
Type
R/W
R/W
R/W
R/W
R/W
R/W
RO
RO
maintained. (Unlike Active bit in Index 30h that also prevents access to Serial Ports 1 or 2 registers.)
devices are active. (Default)
Configuration Register or Action
Activate. See also bit 0 of the SIOCF1 register.
Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b.
Base Address LSB register. Bit [2:0] (for A[2:0]) are RO, 000b.
Interrupt Number.
Interrupt Type. Bit 1 is R/W; other bits are RO.
Report no DMA assignment.
Report no DMA assignment.
Serial Ports 1 and 2 Configuration register.
(Continued)
Table 4-12. Serial Ports 1 and 2 Configuration Register
Table 4-11. Relevant Serial Ports 1 and 2 Registers
Serial Ports 1 and 2 Configuration Register (R/W)
111
affect Serial Ports 1 and 2. Only the last register (F0h) is
described here (Table 4-12). See Table 4-3 "Standard Con-
figuration Registers" on page 104 for descriptions of the
others.
Port 1
00h
03h
F8h
04h
03h
04h
04h
02h
Reset Value: 02h
Reset Value
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Port 2
F8h
00h
02h
03h
03h
04h
04h
02h