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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)： | 59/127頁 |
| 文件大?。?/td> | 1091K |
| 代理商： | PSD4256G6V-10UIT |
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PSD4256G6V
Instructions
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7.2
READ
Under typical conditions, the MCU may read the primary Flash memory, or secondary Flash
memory, using READ operations just as it would a ROM or RAM device. Alternately, the
MCU may use READ operations to obtain status information about a Program or Erase
cycle that is currently in progress. Lastly, the MCU may use instructions to read special data
from these memory blocks. The following sections describe these READ functions.
7.3
READ Memory Contents
Primary Flash memory and secondary Flash memory are placed in the Read mode after
Power-up, chip reset, or a Reset Flash instruction (see Table 29: 16-bit instructions and
Table 30: 8-bit instructions). The MCU can read the memory contents of the primary Flash
memory, or the secondary Flash memory by using READ operations any time the READ
operation is not part of an instruction.
7.4
READ Primary Flash Identifier
The primary Flash memory identifier is read with an instruction composed of 4 operations: 3
specific WRITE operations and a READ operation (see Table 29: 16-bit instructions and
Table 30: 8-bit instructions). The identifier for the primary Flash memory is E9h. The
secondary Flash memory does not support this instruction.
7.5
READ Memory Sector Protection Status
The Flash memory Sector Protection Status is read with an instruction composed of four
operations: three specific WRITE operations and a READ operation (see Table 29: 16-bit
instructions and Table 30: 8-bit instructions). The READ operation produces 01h if the Flash
memory sector is protected, or 00h if the sector is not protected.
The sector protection status for all NVM blocks (primary Flash memory, or secondary Flash
memory) can be read by the MCU accessing the Flash Protection and Flash Boot Protection
registers in PSD I/O space. See Section 10.1: Flash Memory Sector Protect for register
definitions.
7.6
Reading the Erase/Program Status bits
The PSD provides several status bits to be used by the MCU to confirm the completion of an
Erase or Program cycle of Flash memory. These status bits minimize the time that the MCU
spends performing these tasks and are defined in Table 31: Status bits. The status byte
resides in an even location, and can be read as many times as needed. Also note that
DQ15-DQ8 is an even byte for Motorola MCUs with a 16-bit data bus.
For Flash memory, the MCU can perform a READ operation to obtain these status bits while
an Erase or Program instruction is being executed by the embedded algorithm. See
Section 8: Programming Flash memory for details.
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