HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 577
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HD64F7050
Manufacturer Part Number
HD64F7050
Description
32-Bit RISC Microcomputer SuperH RISC engine Family/
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD64F7050.pdf
(841 pages)
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Section 18 ROM (128 kB Version)
18.7.2
Program-Verify Mode
In program-verify mode, the data written in program mode is read to check whether it has been
correctly written in the flash memory.
After the elapse of a given programming time, the programming mode is exited (the P bit in
FLMCR1 is cleared, then the PSUn bit is cleared at least 10 µs later). The watchdog timer is
cleared after the elapse of 10 µs or more, and the operating mode is switched to program-verify
mode by setting the PV bit in FLMCR1. Before reading in program-verify mode, a dummy write
of H'FF data should be made to the addresses to be read. The dummy write should be executed
after the elapse of 4 µs or more. When the flash memory is read in this state (verify data is read in
32-bit units), the data at the latched address is read. Wait at least 2 µs after the dummy write
before performing this read operation. Next, the written data is compared with the verify data, and
reprogram data is computed (see figure 18.7) and transferred to the reprogram data area. After 32
bytes of data have been verified, exit program-verify mode, wait for at least 4 µs, then clear the
SWE bit in FLMCR1. If reprogramming is necessary, set program mode again, and repeat the
program/program-verify sequence as before. However, ensure that the program/program-verify
sequence is not repeated more than 400 times on the same bits.
Rev. 5.00 Jan 06, 2006 page 557 of 818
REJ09B0273-0500
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