Datasheet

Rev.1.00 Date: Aug.04.08

REJ99B2001-0100

6. Program/Erase Power Source, Program/Erase Mode

The program/erase power source voltage as well as the absolute maximum ratings of the pins differ between 3804 Group Flash memory

version and 3804H/3804L Groups. Further more, the program specification (pin used, program algorithm, etc) differs, too. Make sure to

connect the specified programmer with your product to prevent a voltage that exceeds the ratings from being applied to the pins.

7. Stop Mode

In the 3804H and 3804 L Groups, waiting time (more than 100 μsec) until Flash memory can operate after returning from stop mode is

necessary. Use oscillation stabilization time setting function after the STP instruction is released to set it.

8. Internal Power Source Stable Time at Power-on

In the 3804H and 3804 L Groups, internal power source stable time at power-on (td (P-R): max. 2msec) is necessary. Set Vcc to more

than 2.7 V and reset input “L” to td(P-R) + XIN16 cycles or more.

9. Oscillation Circuit Constants

The oscillation circuit structure differs between the 3804, 3804H, and 3804L Groups.

The XIN-XOUT and XCIN-XCOUT oscillation circuit constants differ from product to product. Contact the oscillator manufacturer to select an

appropriate oscillator and oscillation circuit constants so that the product used for mass production will obtain an stable operating clock

with your system and conditions. Additional consideration is required when the voltage range or the temperature range is wide.

Also, we recommend considering the wiring patterns of the feedback resistors, the damping resistors, and the load capacity beforehand

when designing circuits.

10. Differences between Mask ROM and Flash Memory Versions

The Flash memory and Mask ROM versions differ in their manufacturing processes and mask patterns because of the different ROM

types used. Because of these differences, characteristics values, operation margins, noise immunity, noise radiation, and oscillation

circuit constants may vary.

When developing application products, perform careful system evaluations for each product. Additional care is required when replacing

products (for example, replacing a Mask ROM version with a Flash memory version). Careful system evaluations should be performed

with replacement products before the mass production phase of application products.

Replacement Notes (2)