Datasheet

System and Peripheral Control Registers

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2.5.1.38 System Software Interrupt Request 4 Register (SSIR4)

The SSIR4 register, shown in Figure 2-45 and described in Table 2-57, is used for software interrupt

generation.

Figure 2-45. System Software Interrupt Request 4 Register (SSIR4) (offset = BCh)

31 16

Reserved

R-0

15 8 7 0

SSKEY4 SSDATA4

R/W-0 R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n = value after reset

Table 2-57. System Software Interrupt Request 4 Register (SSIR4) Field Descriptions

Bit Field Value Description

31-16 Reserved 0 Read returns 0. Writes have no effect.

15-8 SSKEY4 0-FFh System software interrupt2 request key. A A2h written to these bits initiates IRQ/FIQ interrupts.

Data in this field is always read as 0. The SSKEY4 field can be written into only if the write data

matches the key (A2h). The SSDATA4 field can only be written into if the write data into this field,

the SSKEY4 field, matches the key (A2h).

7-0 SSDATA4 0-FFh System software interrupt data. These bits contain user read/write register bits. They may be used

by the application software as different entry points for the interrupt routine. The SSDATA4 field

cannot be written into unless the write data into the SSKEY4 field matches the key (A2h);

therefore, byte writes cannot be performed on the SSDATA4 field.

178

Architecture SPNU562–May 2014

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