M16C80 Datasheet, PDF (235/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
27. Usage Precaution
Flash memory version
Bit 7 and bit 6 of the processor mode register 1 (address 000516) must be set to "112" and this setting
should be done when the main clock is divided by 8.
Rewrite program of external ROM version with built-in boot loader
• Do not use interrupts in rewrite program.
• Do not use absolute address jump instructions (JMP.A, JMPI.A) and absolute address subroutine call
instructions (JSR.A, JSRI.A) in rewrite program.
Rev.1.00 Aug. 02, 2005 ^{Page 224} of 329
REJ09B0187-0100