HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 408

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

19.1.2
As its on-chip ROM, the H8/3434F has 32 kbytes of flash memory. The flash memory is
connected to the CPU by a 16-bit data bus. The CPU accesses both byte data and word data in two
states.
The H8/3434F’s flash memory is assigned to addresses H'0000 to H'7FFF. The mode pins enable
either on-chip flash memory or external memory to be selected for this area. Table 19.2
summarizes the mode pin settings and usage of the memory area.
Table 19.2 Mode Pin Settings and Flash Memory Area
Mode
Mode 0
Mode 1
Mode 2
Mode 3
19.1.3
Features of the flash memory are listed below.
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Five flash memory operating modes
The flash memory has five operating modes: program mode, program-verify mode, erase
mode, erase-verify mode, and prewrite-verify mode.
Block erase designation
Blocks to be erased in the flash memory address space can be selected by bit settings. The
address space includes a large-block area (four blocks with sizes from 4 kbytes to 8 kbytes)
and a small-block area (eight blocks with sizes from 128 bytes to 1 kbyte).
Program and erase time
Programming one byte of flash memory typically takes 50 s. Erasing all blocks (32 kbytes)
typically takes 1 s.
Erase-program cycles
Flash memory contents can be erased and reprogrammed up to 100 times.
On-board programming modes
These modes can be used to program, erase, and verify flash memory contents. There are two
modes: boot mode and user programming mode.
Mode Programming and Flash Memory Address Space
Features
MD
0
0
1
1
1
Mode Pin Setting
MD
0
1
0
1
0
Memory Area Usage
Illegal setting
External memory area
On-chip flash memory area
On-chip flash memory area