H8SXSLASH1663 datasheet(1007/1158 Pages) RENESAS

1007 / 1158 page

Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 955 of 1102

REJ09B0294-0100

21.12

Usage Notes

1. The initial state of the product at its shipment is in the erased state. For the product whose

revision of erasing is undefined, we recommend to execute automatic erasure for checking the

initial state (erased state) and compensating.

2. For the PROM programmer suitable for programmer mode in this LSI and its program version,

refer to the instruction manual of the socket adapter.

3. If the socket, socket adapter, or product index does not match the specifications, too much

current flows and the product may be damaged.

4. Use a PROM programmer that supports the device with 512-kbyte on-chip flash memory and

3.3-V programming voltage. Use only the specified socket adapter.

5. Do not remove the chip from the PROM programmer nor input a reset signal during

programming/erasing in which a high voltage is applied to the flash memory. Doing so may

damage the flash memory permanently. If a reset is input accidentally, the reset must be

released after the reset input period of at least 100

µs.

6. The flash memory is not accessible until FKEY is cleared after programming/erasing starts. If

the operating mode is changed and this LSI is restarted by a reset immediately after

programming/erasing has finished, secure the reset input period (period of

RES = 0) of at least

100

µs. Transition to the reset state during programming/erasing is inhibited. If a reset is input

accidentally, the reset must be released after the reset input period of at least 100

µs.

7. At powering on or off the Vcc power supply, fix the

RES pin to low and set the flash memory

to hardware protection state. This power on/off timing must also be satisfied at a power-off and

power-on caused by a power failure and other factors.

8. In on-board programming mode or programmer mode, programming of the 128-byte

programming-unit block must be performed only once. Perform programming in the state

where the programming-unit block is fully erased.

9. When the chip is to be reprogrammed with the programmer after execution of programming or

erasure in on-board programming mode, it is recommended that automatic programming is

performed after execution of automatic erasure.

10. To program the flash memory, the program data and program must be allocated to addresses

which are higher than those of the external interrupt vector table and H'FF must be written to

all the system reserved areas in the exception handling vector table.

11. The programming program that includes the initialization routine and the erasing program that

includes the initialization routine are each 4 kbytes or less. Accordingly, when the CPU clock

frequency is 35 MHz, the download for each program takes approximately 60

µs at the

maximum.

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