Flash Memory Version
261
Mitsubishi microcomputers
M16C / 62P Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
development
Preliminary Specifications Rev.1.0
Specifications in this manual are tentative and subject to change.
Table 1.27.1. Flash Memory Version Specifications
Item
Flash Memory Version
Flash Memory Performance
The flash memory version is functionally the same as the mask ROM version except that it internally con-
tains flash memory.
The flash memory version has three modes—CPU rewrite, standard serial input/output, and parallel input/
output modes—in which its internal flash memory can be operated on.
Table 1.27.1 shows the outline performance of flash memory version (see Table 1.1.1 for the items not
listed in Table 1.27.1.).
Flash memory operating mode
Erase block
Method for program
Method for erasure
Program, erase control method
Protect method
Number of commands
Number of program and erasure
ROM code protection
Specification
3 modes (CPU rewrite, standard serial I/O, parallel I/O)
See Figure 1.27.1
1 block (4 Kbytes) (Note 1)
In units of word, in units of byte (Note 2)
Collective erase, block erase
Program and erase controlled by software command
Protected for each block by lock bit
8 commands
100 times
Parallel I/O and standard serial I/O modes are supported.
Note 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.
Note 2: Can be programmed in byte units in only parallel input/output mode.
User ROM area
Boot ROM area
Data Retention
10 years
Table 1.27.2. Flash Memory Rewrite Modes Overview
Flash memory
rewrite mode
Function
CPU rewrite mode
Standard serial I/O mode
Parallel I/O mode
Areas which
can be rewritten
Operation
mode
User ROM area
User ROM area
User ROM area
Boot ROM area
Parallel I/O mode
Single chip mode
Memory expansion mode
(EW0 mode)
Boot mode (EW0 mode)
None
Boot mode
ROM
programmer
Serial programmer
Parallel programmer
The user ROM area is rewrit-
ten by executing software
commands from the CPU.
EW0 mode:
Can be rewritten in any
area other than the flash
memory
EW1 mode:
Can be rewritten in the
flash memory
The user ROM area is rewrit-
ten by using a dedicated se-
rial programmer.
Standard serial I/O mode 1:
Clock sync serial I/O
Standard serial I/O mode 2:
UART
The boot ROM and user
ROM areas are rewritten by
using a dedicated parallel
programmer.