H838532H datasheet(141/508 Pages) RENESAS

141 / 508 page

Section 6 ROM

Rev. 1.00 May 30, 2008 Page 121 of 484

REJ09B0436-0100

Section 6 ROM

6.1

Overview

The H8/38532 has 16 Kbytes of on-chip mask ROM, the H8/38533 has 24 Kbytes, the H8/38534

has 32 Kbytes, the H8/38535 has 40 Kbytes, the H8/38536 has 48 Kbytes, and the H8/38537 has

60 Kbytes. The ROM is connected to the CPU by a 16-bit data bus, allowing high-speed two-state

access for both byte data and word data.

The flash memory version of the H8/38537 is equipped with 60 Kbytes of flash memory. The

flash memory version of the H8/38534 is equipped with 32 Kbytes of flash memory.

6.2

Flash Memory Overview

6.2.1

Features

The features of the 60 Kbytes or 32 Kbytes of flash memory built into the flash memory versions

are summarized below.

• Programming/erase methods

 The 60-Kbyte flash memory is programmed 128 bytes at a time. Erase is performed in

single-block units. The flash memory is configured as follows: 1 Kbyte

× 4 blocks,

28 Kbytes

× 1 block, 16 Kbytes × 1 block, 8 Kbytes × 1 block, 4 Kbytes × 1 block.

The 32-Kbyte flash memory is configured as follows: 1 Kbyte × 4 blocks, 28 Kbytes × 1

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

• Reprogramming capability

 The flash memory can be reprogrammed up to 1,000 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.

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