H838024 datasheet(196/697 Pages) RENESAS

196 / 697 page

Section 6 ROM

Rev. 7.00 Mar 10, 2005 page 154 of 652

REJ09B0042-0700

6.5

Flash Memory Overview

6.5.1

Features

The features of the 32-Kbyte or 16-Kbyte flash memory built into the flash memory versions are

summarized below.

• Programming/erase methods

 The flash memory is programmed 128 bytes at a time. Erase is performed in single-block

units. On the HD64F38024, HD64F38024R, and HD64F38124 the flash memory is

configured as follows: 1 Kbyte × 4 blocks, 28 Kbytes × 1 block. On the HD64F38122 the

flash memory is configured as follows: 1 Kbyte × 4 blocks, 12 Kbytes × 1 block. To erase

the entire flash memory, each block must be erased in turn.

• Reprogramming capability

 The HD64F38024R, HD64F38124, and HD64F38122 can be reprogrammed up to 1,000

times and the HD64F38024 up to 100 times.

• On-board programming

 On-board programming/erasing can be done in boot mode, in which the boot program built

into the chip is started to erase or program of the entire flash memory. In normal user

program mode, individual blocks can be erased or programmed.

• Programmer mode

 Flash memory can be programmed/erased in programmer mode using a PROM

programmer, as well as in on-board programming mode.

• Automatic bit rate adjustment

 For data transfer in boot mode, this LSI's bit rate can be automatically adjusted to match

the transfer bit rate of the host.

• Programming/erasing protection

 Sets software protection against flash memory programming/erasing.

• Power-down mode

 The power supply circuit is partly halted in the subactive mode and can be read in the

power-down mode.

Note:

The system clock oscillator must be used when programming or erasing the flash memory

of the HD64F38124 and HD64F38122.

H838024 Datasheet(PDF) 196 Page - Renesas Technology Corp