M16C30P_07 Datasheet, PDF (299/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
22. Usage Precaution
22.11 Precautions for Programmable I/O Ports
The input threshold voltage of pins differs between programmable input/output ports and peripheral functions.
Therefore, if any pin is shared by a programmable input/output port and a peripheral function and the input level at
this pin is outside the range of recommended operating conditions VIH and VIL (neither “high” nor “low”), the
input level may be determined differently depending on which side-the programmable input/output port or the
peripheral function-is currently selected.
22.12 Electric Characteristic Differences Between Mask ROM and Flash Memory
Version Microcomputers
Flash memory version and mask ROM version may have different characteristics, operating margin, noise tolerated
dose, noise width dose in electrical characteristics due to internal ROM, different layout pattern, etc. When
switching to the mask ROM version, conduct equivalent tests as system evaluation tests conducted in the flush
memory version.
22.13 Mask ROM
When using the masked ROM version, write nothing to internal ROM area.
Rev.1.22 Mar 29, 2007 Page 283 of 291
REJ09B0179-0122