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參數(shù)資料
| 型號： | uPSD3234BV-24U6T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Flash Programmable System Devices with 8032 Microcontroller Core |
| 中文描述： | 閃存可編程系統(tǒng)設(shè)備與8032微控制器內(nèi)核 |
| 文件頁數(shù)： | 108/170頁 |
| 文件大?。?/td> | 2717K |
| 代理商： | UPSD3234BV-24U6T |
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uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
108/170
Reset Flash.
The Reset Flash instruction con-
sists
of
one
WRITE
85., page 101
). It can also be optionally preceded
by the standard two WRITE decoding cycles (writ-
ing AAh to 555h and 55h to AAAh). It must be ex-
ecuted after:
–
Reading the Flash Protection Status or Flash
ID
–
An Error condition has occurred (and the
device has set the Error Flag Bit (DQ5) to '1'
during a Flash memory Program or Erase
cycle.
The Reset Flash instruction puts the Flash memo-
ry back into normal READ Mode. If an Error condi-
tion has occurred (and the device has set the Error
Flag Bit (DQ5) to '1' the Flash memory is put back
into normal READ Mode within 25
μ
s of the Reset
Flash instruction having been issued. The Reset
Flash instruction is ignored when it is issued dur-
ing a Program or Bulk Erase cycle of the Flash
memory. The Reset Flash instruction aborts any
on-going Sector Erase cycle, and returns the
Flash memory to the normal READ Mode within
25
μ
s.
Reset (RESET) Signal.
A pulse on Reset (RE-
SET) aborts any cycle that is in progress, and re-
sets the Flash memory to the READ Mode. When
the reset occurs during a Program or Erase cycle,
the Flash memory takes up to 25
μ
s to return to the
READ Mode. It is recommended that the Reset
(RESET) pulse (except for Power-on RESET, as
described in
RESET TIMING AND DEVICE STA-
TUS AT RESET, page 132
) be at least 25
μ
s so
that the Flash memory is always ready for the
MCU to retreive the bootstrap instructions after the
reset cycle is complete.
SRAM
The SRAM is enabled when SRAM Select (RS0)
from the DPLD is High. SRAM Select (RS0) can
contain up to two product terms, allowing flexible
memory mapping.
The SRAM can be backed up using an external
battery. The external battery should be connected
cycle
(see
Table
to Voltage Stand-by (V
STBY
, PC2). If you have an
external battery connected to the uPSD3200, the
contents of the SRAM are retained in the event of
a power loss. The contents of the SRAM are re-
tained so long as the battery voltage remains at 2V
or greater. If the supply voltage falls below the bat-
tery voltage, an internal power switch-over to the
battery occurs.
PC4 can be configured as an output that indicates
when power is being drawn from the external bat-
tery. Battery-on Indicator (V
BATON
, PC4) is High
with the supply voltage falls below the battery volt-
age and the battery on Voltage Stand-by (V
STBY
,
PC2) is supplying power to the internal SRAM.
SRAM Select (RS0), Voltage Stand-by (V
STBY
,
PC2) and Battery-on Indicator (V
BATON
, PC4) are
all configured using PSDsoft Express Configura-
tion.
Sector Select and SRAM Select
Sector Select (FS0-FS7, CSBOOT0-CSBOOT3)
and SRAM Select (RS0) are all outputs of the
DPLD. They are setup by writing equations for
them in PSDsoft Express. The following rules ap-
ply to the equations for these signals:
1.
Primary Flash memory and secondary Flash
memory Sector Select signals must not
be
larger than the physical sector size.
2.
Any primary Flash memory sector must not
be
mapped in the same memory space as
another Flash memory sector.
3.
A secondary Flash memory sector must not
be
mapped in the same memory space as
another secondary Flash memory sector.
4.
SRAM, I/O, and Peripheral I/O spaces must
not
overlap.
5.
A secondary Flash memory sector may
overlap a primary Flash memory sector. In
case of overlap, priority is given to the
secondary Flash memory sector.
6.
SRAM, I/O, and Peripheral I/O spaces may
overlap any other memory sector. Priority is
given to the SRAM, I/O, or Peripheral I/O.
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| uPSD3234 | Flash Programmable System Device with 8032 Microcontroller Core(嵌入高速“8032微控制器核”的Flash型可編程系統(tǒng)器) |
| uPSD3251(中文) | Flash Programmable System Devices with 8032 Microcontroller Core(帶8032微控制器內(nèi)核的Flash可編程系統(tǒng)設(shè)備) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPSD3234BV-40T1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234BV-40T1T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234BV-40T6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3234BV-40T6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 Microcontroller Core and 64Kbit SRAM |
| UPSD3234BV-40U1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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