Device Registers. The type ioreg represents input/output device register addressing for embedded processors based on the ISO/IEC standard.It is used for both port- and memory mapped device registers, but submerges the distinction...
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Device Registers. The type ioreg represents input/output device register addressing for embedded processors based on the ISO/IEC standard.It is used for both port- and memory mapped device registers, but submerges the distinction between the two kinds of registers to the level of the virtual machine B#EVM. Therefore, the embedded systems developer is not required to specify whether or not a device is either port- or memory-mapped: the ioreg provides a uniform way of handling both. The type ioreg is the base class of three other predefined classes, ioreg8, ioreg16, and ioreg32, which allow read/write access from/to 8-bit, 16-bit, and 32-bit device registers, respectively. Access to the device registers is defined using a mechanism similar to field properties. The only difference between the two is that the address of a ioreg field must be initialized at declaration. The following example declares three device registers as read only, write only, and read/write:
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