h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 697

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

20.1
The LSI (H8S/2646R, H8S/2648R) has 128 kbytes of on-chip flash memory. The features of the
flash memory are summarized below.
• Four flash memory operating modes
• Programming/erase methods
• Programming/erase times
• Reprogramming capability
• On-board programming modes
• Automatic bit rate adjustment
• Flash memory emulation in RAM
• Protect modes
 Program mode
 Erase mode
 Program-verify mode
 Erase-verify mode
The flash memory is programmed 128 bytes at a time. Block erase (in single-block units) can
be performed. To erase the entire flash memory, each block must be erased in turn. Block
erasing can be performed as required on 1 kbyte, 8 kbytes, 16 kbytes, 28 kbytes, and 32 kbytes
blocks.
The flash memory programming time is 10 ms (typ.) for simultaneous 128-byte programming,
equivalent to 78 µs (typ.) per byte, and the erase time is 100 ms (typ.).
The flash memory can be reprogrammed up to 100 times.
There are two modes in which flash memory can be programmed/erased/verified on-board:
 Boot mode
 User program mode
With data transfer in boot mode, the LSI’s bit rate can be automatically adjusted to match the
transfer bit rate of the host.
Flash memory programming can be emulated in real time by overlapping a part of RAM onto
flash memory.
There are two protect modes, hardware and software, which allow protected status to be
designated for flash memory program/erase/verify operations.
Features
Section 20 ROM
Rev. 5.00 Sep 22, 2005 page 671 of 1136
REJ09B0257-0500
Section 20 ROM