SH7125_08 Datasheet, PDF (645/774 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 17 Flash Memory
17.7.2 Other Notes
1. Download Time of On-Chip Program
The programming program that includes the initialization routine and the erasing program that
includes the initialization routine are each 3 Kbytes or less. Accordingly, when the CPU clock
frequency is 20 MHz, the download for each program takes approximately 10 ms at maximum.
2. User Branch Processing Intervals
The intervals for executing the user branch processing differ in programming and erasing. The
processing phase also differs. Table 17.10 lists the maximum interval for initiating the user
branch processing when the CPU clock frequency is 50 MHz.
Table 17.10 Initiation Intervals of User Branch Processing
Processing Name
Programming
Erasing
Maximum Interval
Approximately 4 ms
Approximately 25 ms
However, when operation is done with CPU clock of 50 MHz, maximum value of the time
until first user branch processing is as shown in table 17.11.
Table 17.11 Initial User Branch Processing Time
Processing Name
Programming
Erasing
Max.
Approximately 4 ms
Approximately 25 ms
3. State in which Interrupts are ignored
In the following modes or period, interrupt requests are ignored; they are not executed and the
interrupt sources are not retained.
 Boot mode
Rev. 4.00 Jul. 25, 2008 Page 625 of 750
REJ09B0243-0400