HD64F3694HV Datasheet, PDF (318/452 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 17 EEPROM
17.5 Usage Notes
17.5.1 Data Protection at V_CC On/Off
When V_CC is turned on or off, the data might be destroyed by malfunction. Be careful of the
notices described below to prevent the data to be destroyed.
1. SCL and SDA should be fixed to V_CC or V_SS during V_CC on/off.
2. V_CC should be turned off after the EEPROM is placed in a standby state.
3. When V_CC is turned on from the intermediate level, malfunction is caused, so V_CC should be
turned on from the ground level (V_SS).
4. V_CC turn on speed should be longer than 10 us.
17.5.2 Write/Erase Endurance
The endurance is 10⁵ cycles/page (1% cumulative failure rate) in case of page programming and
10⁴ cycles/byte in case of byte programming. The data retention time is more than 10 years when a
device is page-programmed less than 10⁴ cycles.
17.5.3 Noise Suppression Time
This EEPROM has a noise suppression function at SCL and SDA inputs, that cuts noise of width
less than 50 ns. Be careful not to allow noise of width more than 50 ns because the noise of with
more than 50 ms is recognized as an active pulse.
Rev.5.00 Nov. 02, 2005 Page 288 of 418
REJ09B0028-0500