LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 160

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

CR28
CR28 can only be accessed in the configuration state and after the CSR has been initialized to 28H.
CR28 is used to select the IRQ for Serial Port 1 (bits 7 - 4) and for Serial Port 2 (bits 3 - 0). Refer to
the IRQ encoding for CR27 (Table 90). Any unselected IRQ output (registers CR27 - CR29) is in
tristate. Shared IRQs are not supported in the LPC47N227.
BIT NO.
3:0
7:4
UART2 IRQ
UART1 IRQ
Type: R/W
BIT NAME
Select
Select
These bits are used to select IRQ for Serial Port 2. See IRQ
encoding for CR27 (Table 90).
These bits are used to select IRQ for Serial Port 1. See IRQ
encoding for CR27 (Table 90).
BITS[3:0]
BITS[7:4]
UART Interrupt Selection
Table 90 – IRQ Encoding
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
OR
Table 91 – CR28
160
SELECTED
IRQ_10
IRQ_11
IRQ_12
IRQ_13
IRQ_14
IRQ_15
NONE
IRQ_1
IRQ_2
IRQ_3
IRQ_4
IRQ_5
IRQ_6
IRQ_7
IRQ_8
IRQ_9
IRQ
DESCRIPTION
Default: 0x00 on VCC POR