參數(shù)資料
型號： PSD4256G6V-10UIT
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 1M X 8 FLASH, 52 I/O, PIA-GENERAL PURPOSE, PQFP80
封裝： PLASTIC, TQFP-80
文件頁數(shù)： 55/127頁
文件大?。?/td> 1091K
代理商： PSD4256G6V-10UIT
PSD4256G6V
Detailed operation
6.2.3
Memory operation
The primary Flash memory and secondary Flash memory are addressed through the MCU
Bus Interface. The MCU can access these memories in one of two ways:
●
The MCU can execute a typical bus WRITE or READ operation just as it would if
accessing a RAM or ROM device using standard bus cycles.
●
The MCU can execute a specific instruction that consists of several WRITE and READ
operations. This involves writing specific data patterns to special addresses within the
Flash memory to invoke an embedded algorithm. These instructions are summarized in
Typically, the MCU can read Flash memory using READ operations, just as it would read a
ROM device. However, Flash memory can only be erased and programmed using specific
instructions. For example, the MCU cannot write a single byte directly to Flash memory as
one would write a byte to RAM. To program a word into Flash memory, the MCU must
execute a program instruction, then test the status of the programming event. This status
test is achieved by a READ operation or polling Ready/Busy (PE4).
Flash memory can also be read by using special instructions to retrieve particular Flash
device information (sector protect status and ID).
Table 29.
16-bit instructions(1)(2)(3)(4)
Instruction(5)
FS0-FS15 or
CSBOOT0-
CSBOOT3
Cycle 1
Cycle 2
Cycle 3
Cycle 4
Cycle 5
Cycle 6
Cycle 7
READ(6)
1
“Read”
RD @ RA
READ Main Flash
ID(7)(8)
1
AAh@
XAAAh
55h@
X554h
90h@
XAAAh
Read ID
@ XX02h
READ Sector
Protection(7)(8)(9)
1
AAh@
XAAAh
55h@
X554h
90h@
XAAAh
Read 00h
or 01h @
XX04h
Program a Flash
Word(8)
1
AAh@
XAAAh
55h@
X554h
A0h@
XAAAh
PD@ PA
Flash Sector
Erase(8)(10)
1
AAh@
XAAAh
55h@
X554h
80h@
XAAAh
AAh@
XAAAh
55h@
X554h
30h@
SA
30h(7)@
next SA
Flash Bulk Erase(8)
1
AAh@
XAAAh
55h@
X554h
80h@
XAAAh
AAh@
XAAAh
55h@
X554h
10h@
XAAAh
Suspend Sector
Erase(11)
1
B0h@
XXXXh
Resume Sector
Erase(12)
1
30h@
XXXXh
1
F0h@
XXXXh
Unlock Bypass
1
AAh@
XAAAh
55h@
X554h
20h@
XAAAh
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