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Revision 4.1

Functional Description (Continued)

3.7.2.3

IRQ Configuration Registers

The CS5530 provides the ability to set and clear IRQs

internally through software control. If the IRQs are config-

ured for software control, they will not respond to external

hardware. There are three registers provided for this fea-

ture:

• Internal IRQ Enable Register

• Internal IRQ Mask Register

• Internal IRQ Control Register

Internal IRQ Enable Register - This register configures

the IRQs as internal (software) interrupts or external

(hardware) interrupts. Any IRQ used as an internal soft-

ware driven source must be configured as internal.

Internal IRQ Mask Register -Eachbit in theMaskregis-

ter individually disables the corresponding bit in the Con-

trol Register.

Internal IRQ Control Register - This register allows indi-

vidual software assertion/deassertion of the IRQs that are

enabled as internal and unmasked.

The bit formats for these registers are given in Table 3-69.

Table 3-69. IRQ Configuration Registers

Bit

Description

F3BAR+Memory Offset 1Ah-1Bh

Internal IRQ Enable Register (R/W)

Reset Value = 0000h

Note: Must be R/W as a WORD.

IRQ15 Internal: Configure IRQ15 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

IRQ14 Internal: Configure IRQ14 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

Reserved: Set to 0.

IRQ12 Internal: Configure IRQ12 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

IRQ11 Internal: Configure IRQ11 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

IRQ10 Internal: Configure IRQ10 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

IRQ9 Internal: Configure IRQ9 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

Reserved: Set to 0.

IRQ7 Internal: Configure IRQ7 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

Reserved: Set to 0.

IRQ5 Internal: Configure IRQ5 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

IRQ4 Internal: Configure IRQ4 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

IRQ3 Internal: Configure IRQ3 for internal (software) or external (hardware) use: 0 = External; 1 = Internal.

2:0

Reserved: Set to 0.

Note: This register must be read and written as a WORD.

F3BAR+Memory Offset 1Ch-1Dh

Internal IRQ Control Register (R/W)

Reset Value = 00000000h

Assert Masked Internal IRQ15: 0 = Disable; 1 = Enable.

Assert Masked Internal IRQ14: 0 = Disable; 1 = Enable.

Reserved: Set to 0.

Assert Masked Internal IRQ12: 0 = Disable; 1 = Enable.

Assert masked internal IRQ11: 0 = Disable; 1 = Enable.

Assert Masked Internal IRQ10: 0 = Disable; 1 = Enable.

Assert Masked Internal IRQ9: 0 = Disable; 1 = Enable.

Reserved: Set to 0.

Assert Masked Internal IRQ7: 0 = Disable; 1 = Enable.

Reserved: Set to 0.

Assert Masked Internal IRQ5: 0 = Disable; 1 = Enable.

Assert Masked Internal IRQ4: 0 = Disable; 1 = Enable.

Assert Masked Internal IRQ3: 0 = Disable; 1 = Enable.

2:0

Reserved: Set to 0.

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