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)： 60/127頁
文件大?。?/td> 1091K
代理商： PSD4256G6V-10UIT
Instructions
PSD4256G6V
7.7
Data Polling (DQ7) - DQ15 for Motorola
When erasing or programming in Flash memory, the Data Polling bit (DQ7/DQ15) outputs
the complement of the bit being entered for programming/writing on the DQ7/DQ15 bit.
Once the Program instruction or the WRITE operation is completed, the true logic value is
read on the Data Polling bit (DQ7/DQ15) (in a READ operation).
●
Data polling is effective after the fourth WRITE pulse (for a Program instruction) or after
the sixth WRITE pulse (for an Erase instruction). It must be performed at the address
being programmed or at an address within the Flash memory sector being erased.
●
During an Erase cycle, the Data Polling bit (DQ7/DQ15) outputs a '0.' After completion
of the cycle, the Data Polling bit (DQ7/DQ15) outputs the last bit programmed (it is a '1'
after erasing).
●
If the location to be programmed is in a protected Flash memory sector, the instruction
is ignored.
●
If all the Flash memory sectors to be erased are protected, the Data Polling bit
(DQ7/DQ15) is reset to '0' for about 100 s, and then returns to the value from the
previously addressed location. No erasure is performed.
7.8
Toggle Flag (DQ6) – DQ14 for Motorola
The PSD offers another way for determining when the Flash memory Program cycle is
completed. During the internal WRITE operation and when either FS0-FS15 or CSBOOT0-
CSBOOT3 is true, the Toggle Flag bit (DQ6/DQ14) toggles from 0 to '1' and '1' to '0' on
subsequent attempts to read any word of the memory.
When the internal cycle is complete, the toggling stops and the data read on the Data Bus
D0-D7 is the value from the addressed memory location. The device is now accessible for a
new READ or WRITE operation.
Table 31.
Status bits
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
Data
Polling
Toggle
Flag
Error Flag
X
Erase
Time-out
XX
X
Status bits for Motorola 16-bit MCU(1)
1.
X = Not guaranteed value, can be read either '1' or '0.'
DQ15-DQ0 represent the Data Bus bits, D15-D0.
FS0-FS15/CSBOOT0-CSBOOT3 are active High.
DQ15
DQ14
DQ13
DQ12
DQ11
DQ10
DQ9
DQ8
Data
Polling
Toggle
Flag
Error Flag
X
Erase
Time-out
XX
X
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