參數(shù)資料
型號(hào)： 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)： 54/127頁
文件大小： 1091K
代理商： PSD4256G6V-10UIT
Detailed operation
PSD4256G6V
6.2
Primary Flash memory and secondary Flash memory
description
The primary Flash memory is divided evenly into 8 sectors. The secondary Flash memory is
divided into 4 sectors of different size. Each sector of either memory block can be separately
protected from program and erase cycles.
Flash memory may be erased on a sector-by-sector basis, and programmed word-by-word.
Flash sector erasure may be suspended while data is read from other sectors of the block
and then resumed after reading.
During a program or erase cycle in Flash memory, the status can be output on the
Ready/Busy pin (PE4). This pin is set up using PSDsoft.
6.2.1
Memory Block Select signals
The DPLD generates the Select signals for all the internal memory blocks (see Section 15:
PLDs). Each of the sectors of the primary Flash memory has a Select signal (FS0-FS15)
which can contain up to three product terms. Each of the sectors of the secondary Flash
memory has a Select signal (CSBOOT0-CSBOOT3) which can contain up to three product
terms. Having three product terms for each Select signal allows a given sector to be
mapped in different areas of system memory. When using a MCU with separate program
and data space (80C51XA), these flexible Select signals allow dynamic re-mapping of
sectors from one memory space to the other before and after IAP. The SRAM block has a
single Select signal (RS0).
6.2.2
Ready/Busy (PE4)
This signal can be used to output the Ready/Busy status of the PSD. The output is a '0'
(Busy) when a Flash memory block is being written to, or when a Flash memory block is
being erased. The output is a '1' (Ready) when no WRITE or Erase cycle is in progress.
13
64
FS13
14
64
FS14
15
64
FS15
Total
1024
16 Sectors
64
4 Sectors
32
Table 28.
Memory block size and organization (continued)
Sector
number
Primary Flash memory
Secondary Flash memory
SRAM
Sector size
(Kbytes)
Sector
Select
signal
Sector size
(Kbytes)
Sector
Select
signal
SRAM size
(bytes)
SRAM
Select
signal
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