SH7041A datasheet(719/923 Pages) RENESAS

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Section 22 256kB Flash Memory (F-ZTAT)

22.1

Features

This LSI has 256 kbytes of on-chip flash memory. The features of the flash memory are

summarized below.

• Four flash memory operating modes

 Program mode

 Erase mode

 Program-verify mode

 Erase-verify mode

• Programming/erase methods

The flash memory is programmed 32 bytes at a time. Block erase (in single-block units) can be

performed. Block erasing can be performed as required on 1 kbyte, 28 kbyte, and 32 kbyte

blocks.

• Programming/erase times

The flash memory programming time is 10 ms (typ.) for simultaneous 32-byte programming,

equivalent to 300 µs (typ.) per byte, and the erase time is 100 ms (typ.) per block.

• Reprogramming capability

The flash memory can be reprogrammed up to 100 times.

• On-board programming modes

There are two modes in which flash memory can be programmed/erased/verified on-board:

 Boot mode

 User program mode

• Automatic bit rate adjustment

With data transfer in boot mode, this LSI’s bit rate can be automatically adjusted to match the

transfer bit rate of the host.

• Flash memory emulation in RAM

Flash memory programming can be emulated in real time by overlapping a part of RAM onto

flash memory.

• Protect modes

There are two protect modes, hardware and software, which allow protected status to be

designated for flash memory program/erase/verify operations

• Programmer mode

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

as well as in on-board programming mode.

SH7041A Datasheet(PDF) 719 Page - Renesas Technology Corp