SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 110

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

APPLICATION NOTE: If both UARTs are configured to use different IRQs and the share IRQ bit is set, then both
Rev 0.2 (09-28-04)
SCH3112
SCH3114
DEVICE
Table
is used:
■
■
■
■
■
■
■
■
■
Table 25.1
page 286
SHARE
N/A - not applicable
NS - port not shared
S12 - uart 1 and uart 2 share an IRQ
S34 - uart 3 and uart 4 share an IRQ
S56 - uart 5 and uart 6 share an IRQ
S1234 - UARTS 1,2,3,4 share the same IRQ
S1256 - UARTS 1,2,5,6 share the same IRQ
S3456 - UARTS 3,4,5,6 share the same IRQ
S123456 - all uarts share the same IRQ
MODE
(0XF0)
REG
BIT6
ALL
2 on
SP1
BIT
8.8, summarizes the various IRQ sharing configurations. In this table, the following nomenclature
0
0
1
1
0
0
0
0
1
1
1
1
of the UART IRQs will assert when either UART generates an interrupt.
Table 25.1
page 286
SHARE
MODE
(0XF0)
SP12
Table 8.8 SCH311X IRQ Sharing Summary
REG
BIT7
2 on
SP1
BIT
0
1
0
1
0
1
0
1
0
1
0
1
Table 25.1
page 289
SHARE
MODE
(0XF0)
SP34
REG
BIT7
6 on
SP3
N/A
N/A
N/A
N/A
BIT
0
0
1
1
0
0
1
1
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
94
Table 25.1
page 290
SHARE
MODE
(0XF0)
SP56
REG
BIT7
8 on
SP5
BIT
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
SP1
S12
S12
S12
S12
S12
S12
NS
NS
NS
NS
NS
NS
34
SP2
S12
S12
S12
S12
S12
S12
NS
NS
NS
NS
NS
NS
34
SP3
S34
S34
S34
S12
N/A
N/A
N/A
N/A
NS
NS
NS
NS
34
SP4
S34
S34
S34
S12
N/A
N/A
N/A
N/A
NS
NS
NS
NS
34
SMSC SCH311X
SP5
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Datasheet
SP6
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A