CT-161-CD Fujitsu Semiconductor America Inc, CT-161-CD Datasheet - Page 103

• Manufacturer Part Number: CT-161-CD
• Description: KIT 16LX FOR MB90F387
• Manufacturer: Fujitsu Semiconductor America Inc
• Series: F²MC-16LXr
• Type: MCUr

Specifications of CT-161-CD

• Contents: Board, Cable, CD
• For Use With/related Products: MB90F387S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 865-1103

B Appendix (Method To Write/Read Values in Registers)
© Fujitsu
B.1
The sample program codes presented in this document include such descriptions
as ”IO_XXX.byte” and ”IO_YYY.bit”. These are the convenient formats of description
defined in the I-O header file. You can use these description formats after setting up Softune
Workbench, the development environment provided by the Starter Kit.
An actual C-language program contains the descriptions of instructions to write values to
various registers to specify microcomputer operation. The above description formats enable
you to write values to registers in C language. For example, assume the instruction to write
0xff to the port 1 data register (PDR1), which is allocated at address 0x000001. The
instruction is described in C language as follows:
It is not immediately obvious what kind of processing the above description specifies. If you
use one of the description formats defined in the I-O header file, you can write the same
instruction as follows:
You can use this description because the following operation is defined in a separate file:
Substituting a value for variable "IO_PDR1.byte" ＝ Writing the value to PDR1 register at
address 0x000001
It is now immediately clear that the description specifies the processing to write 0xff to the
PDR1 register. The I-O header file contains the definitions of these description formats for
the registers of the microcomputer built in the Starter Kit.
*((volatile char *)0x000001) = 0xFF;
IO_PDR1.byte = 0xff;
About the Method To Write/Read Values in Registers
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