W83877ATG Nuvoton Technology Corporation of America, W83877ATG Datasheet - Page 144

• Manufacturer Part Number: W83877ATG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83877ATG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

SCIIRQ3 ~ SCIIRQ0 (Bit 7 - bit 4):
The four bits select one IRQ pin for the SCI signal except for dedicated SCI signal output pin. Any
unselected pin is in tri-state.
While in the Serial IRQ mode (IRQMODS=1, CR31 bit 2), the above selection is invalid and all the IRQ
signal pins, from IRQ_A to IRQ_H, are all in tri-state. The SCI interrupt output is dedicated to the
SERIRQ pin. For the host controller to correctly sample the SCI interrupt, the SCI interrupt should be
programmed to appear in one of IRQ/Data Frame sampling periods.
In Serial IRQ mode, the definition of SCIIQS3-SCIIQS0 (bit 7-bit 4) is as follows:
SCIIQS3-SCIIQS0 (bit 7-bit 4): Select the IRQ/Data sampling period on the SERIRQ pin.
Bit 3: Reserved.
CR31[7:4]
0000
0001
0010
0011
0100
0101
0110
0111
1000
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CR27[7:4]
None (default)
IRQ_A
IRQ_B
IRQ_C
IRQ_D
IRQ_E
IRQ_F
IRQ_G
IRQ_H
- 137 -
MAPPED IRQ PIN
W83877ATF/W83877ATG
IRQ/DATA FRAME PERIOD
Reserved for SMI
Publication Release Date:November 2006
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
None
IRQ1
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
Version 1.0