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5.6 Viewing the I/O Memory

A microcomputer contains on-chip peripheral modules. The exact number and type of peripheral modules differ

between devices but the typical modules are a DMA controller, serial communications interface, A/D converter,

integrated timer unit, bus state controller, and watchdog timer. Registers that are mapped to the microcomputer’s

address space controls the on-chip peripheral modules.

The [Memory] window enables you to look at data in continuous memory addresses as byte, word, longword,

single-precision floating-point, double-precision floating-point, or ASCII values. However, registers of different

sizes are allocated to non-continuous memory addresses in the I/O memory. To handle this memory, the HEW

has the [IO] window to facilitate checking and setting up of these kinds of registers.

5.6.1 Opening the [IO] Window

To open the [IO] window, select [View -> CPU -> IO] or click the [View I/O] toolbar button (

). Modules that

match the on-chip peripheral modules organize the I/O register information. When the [IO] window is first

opened, only a list of module names is displayed.

Figure 5.28 [IO] Window

5.6.2 Expanding the I/O Register Display

To display the names, addresses, and values of the I/O registers, click the [+] mark at the left of the module name

or select the module name by clicking on it or using the cursor keys and press the [->] key. The module display

will expand to show the individual registers of that peripheral module and their names, addresses, and values.

Clicking the [-] mark at the left of the expanded module name or pressing the [<-] key will close the I/O register

display.

For a display in the bit level, click the [+] mark at the left of the register name or select the register name by

clicking on it or using the cursor keys and press the [->] key. The register display will expand to show the names

of register bits and values. Clicking the [-] mark at the left of the expanded register name or pressing the [<-] key

will close the register bits display.

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Renesas H8S/2628 Información técnica Pagina 227