HD64336900G Datasheet, PDF (121/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 7 ROM
The features of the 12-kbyte (including 4 kbytes as the E7 control program area) flash memory
built into the HD64F36912G and HD64F36902G are summarized below.
• Programming/erase methods
 The flash memory is programmed in 64-byte units at a time. Erase is performed in single-
block units. The flash memory is configured as follows: 1 kbyte × 4 blocks and 4 kbytes ×
2 blocks. To erase the entire flash memory, each block must be erased in turn.
• Reprogramming capability
 The flash memory can be reprogrammed up to 1,000 times.
• On-board programming
 On-board programming/erasing can be done in boot mode, in which the boot program built
into the chip is started to erase or program of the entire flash memory. In normal user
program mode, individual blocks can be erased or programmed.
• Automatic bit rate adjustment
 For data transfer in boot mode, this LSI's bit rate can be automatically adjusted to match
the transfer bit rate of the host.
• Programming/erasing protection
 Sets software protection against flash memory programming/erasing.
ROM3321A_000120030300
Rev. 1.00, 11/03, page 93 of 376