HD64F2149YV datasheet(760/1075 Pages) RENESAS

760 / 1075 page

Section 22 ROM

Rev. 3.00 Jan 18, 2006 page 732 of 1044

REJ09B0280-0300

22.10.10

Notes On Memory Programming

• When programming addresses which have previously been programmed, carry out auto-

erasing before auto-programming.

• When performing programming using programmer mode on a chip that has been

programmed/erased in an on-board programming mode, auto-erasing is recommended before

carrying out auto-programming.

Notes: 1. The flash memory is initially in the erased state when the device is shipped by Renesas

Technology. For other chips for which the erasure history is unknown, it is

recommended that auto-erasing be executed to check and supplement the initialization

(erase) level.

2. Auto-programming should be performed once only on the same address block.

22.11

Flash Memory Programming and Erasing Precautions

Precautions concerning the use of on-board programming mode and programmer mode are

summarized below.

Use the specified voltages and timing for programming and erasing: Applied voltages in

excess of the rating can permanently damage the device. Use a PROM programmer that supports

3.3 V programming voltage for Renesas Technology microcomputer device types with 64-kbyte

on-chip flash memory.

Do not select the HN28F101 setting for the PROM programmer or 5.0 V setting for the

programming voltage, and only use the specified socket adapter. Incorrect use will result in

damaging the device.

Powering on and off: When applying or disconnecting V

CC, fix the RES pin low and place the

flash memory in the hardware protection state.

The power-on and power-off timing requirements should also be satisfied in the event of a power

failure and subsequent recovery.

Use the recommended algorithm when programming and erasing flash memory: The

recommended algorithm enables programming and erasing to be carried out without subjecting the

device to voltage stress or sacrificing program data reliability. When setting the P or E bit in

FLMCR1, the watchdog timer should be set beforehand as a precaution against program runaway,

etc.

HD64F2149YV Folha de dados(PDF) 760 Page - Renesas Technology Corp