INTERNAL MEMORY
6.5 Programming the Internal Flash Memory
6
6.5.5 Flash Programming Time (Reference)
The following shows the time needed to program internal flash memory for reference.
(1) Time required for transfer by SIO (for a transfer data size of 1,024 KB)
1/57,600 bps × 1 (frame) × 11 (number of bits transferred) × 1,024 KB = approx. 200.2 [s]
(2) Time required for programming the flash memory
1,024 KB / 256-byte block × 8 ms = approx. 32.8 [s]
(3) Time required for erasing the entire area
50 ms × 19 (blocks) = approx. 950 [ms]
(4) Total flash programming time (entire 1,024 KB area)
When communicating at 57,600 bps via UART, the flash programming time can be ignored because it is very
short compared to the serial communication time. Therefore, the total flash programming time can be calcu-
lated using the equation below.
(1) + (3) = approx. 201 [s]
If the transfer time can be ignored by speeding up the serial communication or by other means, the fastest
programming time possible can be calculated using the equation below.
(2) + (3) = approx. 34 [s]
32180 Group User’s Manual (Rev.1.0)
6-29
RENESAS [ RENESAS TECHNOLOGY CORP ]
