Renesas Hitachi H8S/2191, Hardware Manual

Page: 199 / 1065

Rev. 2.0, 11/00, page 172 of 1037
8.2 Overview of Flash Memory
8.2.1 Features
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. Erasing is performed by block erase
(in single-block units). When erasing all blocks, the individual blocks must be erased
sequentially. Block erasing can be performed as required on 1-kbyte, 8-kbyte, 16-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
µ
s (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
If data transfer on boot mode, automatic adjustment is possible at host transfer bit rates and
MCU's bit rates.
•
Protect modes
There are three protect modes, hardware, software, and error protect, 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.