SH7144_08 Datasheet, PDF (701/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

19. Flash Memory (F-ZTAT Version)
Section 19 Flash Memory (F-ZTAT Version)
The features of the flash memory in the flash memory version are summarized below.
The block diagram of the flash memory is shown in figure 19.1.
19.1 Features
• Size: 256 kbytes
• Programming/erasing methods
⎯ The flash memory is programmed 128 bytes at a time. Erase is performed in single-block
units. The flash memory is configured as follows: 64 kbytes × 3 blocks, 32 kbytes × 1
block, and 4 kbytes × 8 blocks. To erase the entire flash memory, each block must be
erased in turn.
• Reprogramming capability
See section 26.5, Flash Memory Characteristics.
• Two on-board programming modes
⎯ Boot mode
⎯ User program mode
⎯ 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.
• PROM 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
⎯ With data transfer in boot mode, this LSI's bit rate can be automatically adjusted to match
the transfer bit rate of the host computer.
• Programming/erasing protection
⎯ Sets software protection against flash memory programming/erasing/verifying.
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