r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 908

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Section 22 Flash Memory
• Using on-chip RAM to emulate flash memory
• Protection modes
• Programming/erasing time
• Number of programming operations
• Operating frequency for programming/erasing
Rev. 1.00 Sep. 21, 2007 Page 882 of 1124
REJ09B0402-0100
 User branching
Programming is performed in 128-byte units. Each round of programming consists of
application of the programming pulse, reading for verification, and several other steps. Erasing
is performed in block units and each round of erasing consists of several steps. A user-
processing routine can be executed between each round of erasing, and making the setting for
this is called the addition of a user branch.
By laying on-chip RAM over part of the flash memory, flash-memory programming can be
emulated in real time.
There are two modes of protection: software protection is applied by register settings and
hardware protection is applied by the level on the FWE pin. Protection of the flash memory
from programming or erasure can be selected.
When an abnormal state is detected, such as runaway execution of programming/erasing, the
protection modes initiate the transition to the error protection state and suspend
programming/erasing processing.
The time taken to program 128 bytes of flash memory in a single round is t
equivalent to t
The flash memory can be programmed up to N
The operating frequency for programming/erasing is a maximum of 40 MHz (Pφ).
P
/128 ms per byte. The erasing time is t
WEC
times.
E
s (typ.) per block.
P
ms (typ.), which is