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M16C/62P Group (M16C/62P, M16C/62PT)
22. Flash Memory Version
Aside from the built-in flash memory, the flash memory version microcomputer has the same functions as the
masked ROM version.
In the flash memory version, the flash memory can perform in three rewrite modes: CPU rewrite mode, stan-
dard serial I/O mode and parallel I/O mode.
Table 22.1 lists specifications of the flash memory version. See Tables 1.1 to 1.3 Performance outline of
M16C/62PT group for the items not listed in Table 22.1.
Table 22.1 Flash Memory Version Specifications
Item
Flash Memory Operating Mode
User ROM Area
Erase Block
Boot ROM Area
Program Method
Erase Method
Program and Erase Control Method
Protect Method
Number of Commands
Program and Erase Endurance
Data Retention
ROM Code Protection
NOTES:
1. The boot ROM area contains a standard serial I/O mode rewrite control program which is stored in it when
shipped from the factory. This area can only be rewritten in parallel input/output mode.
2. Can be programmed in byte units in only parallel input/output mode.
3. Block 1 and block A are guaranteed of 10,000 times of programming and erasure. All other blocks are
guaranteed of 1,000 times of programming and erasure.
4. Definition of program and erase endurance
The programming and erasure times are defined to be per-block erasure times. For example, assume
a case where a 4-Kbyte block A is programmed in 2,048 operations by writing one word at a time and
erased thereafter.
In this case, the block is reckoned as having been programmed and erased once.
If a product is guaranteed of 100 times of programming and erasure, each block in it can be erased up to
100 times. When guaranteed of 10,000 times of programming and erasure, block 1 and block A can each
be erased up to 10,000 times. All other blocks can each be erased up to 1,000 times.
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3 modes (CPU rewrite, standard serial I/O, parallel I/O)
See Figure 22.1 Flash Memory Block Diagram
1 block (4 Kbytes)
In units of word, in units of byte
Collective erase, block erase
Program and erase controlled by software command
The lock bit protects each block
8 commands
100 times, 1,000 times/10,000 times (option)
10 years
Parallel I/O and standard serial I/O modes are supported
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22. Flash Memory Version
Specification
(1)
(2)
(3, 4)
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