UPD78F1502AGK-GAK-AX Datasheet, PDF (849/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 26 OPTION BYTE
26.4 Setting of Option Byte
The user option byte and on-chip debug option byte can be set using the RA78K0R or PM+ linker option, in addition to
describing to the source. When doing so, the contents set by using the linker option take precedence, even if descriptions
exist in the source, as mentioned below.
See the RA78K0R Assembler Package User’s Manual for how to set the linker option.
A software description example of the option byte setting is shown below.
OPT CSEG
DB
DB
DB
DB
OPT_BYTE
36H
; Does not use interval interrupt of watchdog timer,
; Enables watchdog timer operation,
; Window open period of watchdog timer is 50%,
; Overflow time of watchdog timer is 2¹⁰/fIL,
; Stops watchdog timer operation during HALT/STOP mode
0FBH ; Select 8 MHz or 20 MHz for internal high-speed oscillator
; Stops LVI default start function
0FFH ; Reserved area
85H
; Enables on-chip debug operation, does not erase flash memory
; data when security ID authorization fails
When the boot swap function is used during self programming, 000C0H to 000C3H is switched to 010C0H to 010C3H.
Describe to 010C0H to 010C3H, therefore, the same values as 000C0H to 000C3H as follows.
OPT2 CSEG AT 010C0H
DB
36H
; Does not use interval interrupt of watchdog timer,
; Enables watchdog timer operation,
; Window open period of watchdog timer is 50%,
; Overflow time of watchdog timer is 2¹⁰/fIL,
; Stops watchdog timer operation during HALT/STOP mode
DB
0FBH ; Select 8 MHz or 20 MHz for internal high-speed oscillator
; Stops LVI default start function
DB
0FFH ; Reserved area
DB
85H
; Enables on-chip debug operation, does not erase flash memory
; data when security ID authorization fails
Caution To specify the option byte by using assembly language, use OPT_BYTE as the relocation attribute
name of the CSEG pseudo instruction. To specify the option byte to 010C0H to 010C3H in order to
use the boot swap function, use the relocation attribute AT to specify an absolute address.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011