SH7052 Datasheet, PDF (713/919 Pages) Renesas Technology Corp – SuperHTM RISC engine

Section 20 ROM (SH7052F/SH7053F)
20.1 Features
The SH7052F/SH7053F 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 128 bytes at a time. Block erase (in single-block units) can
be performed. To erase the entire flash memory, individual blocks must be erased in turn.
Block erasing can be performed as required on 4 kB, 32 kB, and 64 kB blocks.
• Programming/erase times
The flash memory programming time is 7 ms (typ.) for simultaneous 128-byte programming,
equivalent to 55 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, the SH7052F/SH7053F’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.
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