
FLASH MEMORY VERSION
7902 Group User’s Manual
20-2
20.1 Overview
The flash memory version is provided with the same function as that of the mask ROM version except that
the former includes the flash memory. Note that, however, part of the SFR area of the flash memory version
differs from that of the mask ROM or external ROM version. (Refer to section “20.1.1 Memory assignment.”)
In the flash memory version, its internal flash memory can be handled in the following three reprogramming
modes: flash memory CPU reprogramming mode, flash memory serial I/O mode, and flash memory parallel
I/O mode.
Table 20.1.1 lists the performance overview of the flash memory version. (For the items not listed in Table
20.1.1, see Table 1.1.1.)
Table 20.1.1 Performance overview of flash memory version
Item
Performance
Power source voltage
Programming/Erase voltage
Programming
Erase method
Flash memory reprogramming modes
Maximum number of reprograms (programming
and erasure)
M37902FGCGP
M37902FGMHP
M37902FGCGP
M37902FGMHP
5 V ± 0.5 V
3.3 V ± 0.3 V
5 V ± 0.5 V(3.3 V ± 0.3 V only in flash memory parallel I/O mode)
3.3 V ± 0.3 V
Programmed in a unit of 128 ward (256 bytes)
Block erase or Total erase
Flash memory CPU reprogramming mode
Flash memory serial I/O mode
Flash memory parallel I/O mode
100
For the flash memory version, in addition to the same three processor modes as those of the mask ROM
version, any of the four operating modes listed in Table 20.1.2 can further be selected by the voltage level
applied to pin MD1. Table 20.1.3 also lists the overview of flash memory reprogramming modes.
Note: Do not switch the voltages applied to pins MD0 and MD1 while the microcomputer is active.
Table 20.1.2 Operating mode selection according to
voltages applied to pins MD0 and MD1
Single-chip mode,
Memory expansion mode,
Microprocessor mode (Note 1)
Boot mode (Note 2)
Flash memory parallel I/O mode
(Note 3)
VSS
VCC
VSS
VCC
MD1
VSS
VCC
MD0
Operating modes
Notes 1: Refer to section “2.5 Processor modes.”
2: Refer to section “20.1.2 Boot mode.”
3: Refer to section “20.4 Flash memory parallel
I/O mode.”