System and Peripheral Control Registers
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SPNU563A–March 2018
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Architecture
2.5.1.37 System Software Interrupt Request 3 Register (SSIR3)
The SSIR3 register, shown in Figure 2-44 and described in Table 2-56, is used for software interrupt
generation.
Figure 2-44. System Software Interrupt Request 3 Register (SSIR3) (offset = B8h)
31 16
Reserved
R-0
15 8 7 0
SSKEY3 SSDATA3
R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 2-56. System Software Interrupt Request 3 Register (SSIR3) Field Descriptions
Bit Field Value Description
31-16 Reserved 0 Reads return 0. Writes have no effect.
15-8 SSKEY3 0-FFh System software interrupt request key. A 93h written to these bits initiates IRQ/FIQ interrupts. Data
in this field is always read as 0. The SSKEY3 field can be written into only if the write data
matches the key (93h). The SSDATA3 field can only be written into if the write data into this field,
the SSKEY3 field, matches the key (93h).
7-0 SSDATA3 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 SSDATA3 field
cannot be written into unless the write data into the SSKEY3 field matches the key (93h);
therefore, byte writes cannot be performed on the SSDATA3 field.
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