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CHAPTER 25 DUAL OPERATION FLASH MEMORY
25.1 Overview
25.1
Overview
The dual operation Flash memory is located at 0x1000 to 0x1FFF and at 0xF000
to 0xFFFF for 64 Kbit Flash memory, at 0x1000 to 0x1FFF and at 0xE000 to
0xFFFF for 96 Kbit Flash memory, at 0x1000 to 0x1FFF and 0xC000 to 0xFFFF
for 160 Kbit Flash memory, or at 0x1000 to 0x1FFF and 0x8000 to 0xFFFF for
288 Kbit Flash memory on the CPU memory map.
The dual operation Flash memory consists of an upper bank and a lower bank*.
Unlike conventional Flash products, writing/erasing data to/from one bank and
reading data from another bank can be executed simultaneously.
*: MB95F636H/F636K:
upper bank: 32 Kbyte × 1; lower bank: 2 Kbyte × 2
MB95F634H/F634K:
upper bank: 16 Kbyte × 1; lower bank: 2 Kbyte × 2
MB95F633H/F633K:
upper bank: 8 Kbyte × 1; lower bank: 2 Kbyte × 2
MB95F632H/F632K:
upper bank: 4 Kbyte × 1; lower bank: 2 Kbyte × 2
■ Overview of Dual Operation Flash Memory
The following methods can be used to write data into and erase data from the Flash memory:
•
Programming/erasing using a dedicated serial programmer
•
Programming/erasing by program execution
Since data can be written into and erased from the Dual operation Flash memory by
instructions from the CPU via the Flash memory interface circuit, program code and data can
be efficiently updated with the device mounted on a circuit board. The minimum sector size of
the dual operation Flash is 2 Kbyte, which is a sector configuration facilitating the management
of the program/data area.
Data can be updated by executing a program in RAM or by executing a program in the Flash
memory in dual operation. The erase/program operation and the read operation can be executed
in different banks (upper bank/lower bank) simultaneously.
The dual operation Flash can use the following combinations:
Sector erase (erase suspend)
532
Upper bank
Read
Program/sector erase
Chip erase
Program
FUJITSU SEMICONDUCTOR LIMITED
Lower bank
Read
Program/sector erase
Read
Program
Sector erase (erase suspend)
MB95630H Series
MN702-00009-1v0-E
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