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System and Peripheral Control Registers
191
SPNU563A–March 2018
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Architecture
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 Reads return 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.
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