PSD813F2 Datasheet

IC型号：
PSD813F2
PDF描述：
FLASH IN-SYSTEM PROGRAMMABLE (ISP) PERIPHERALS FOR 8-BIT MCU...
文件大小：
1180.57KB
芯片厂家：
STMicroelectronics

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PSD8XX Family

PSD835G2

9.1.1.9.3 Flash Erase Suspend Instruction

When a Flash Sector Erase operation is in progress, the Erase Suspend instruction will

suspend the operation by writing 0B0h to any even address when an appropriate Chip

Select (FSi or CSBOOTi) is true. (See Table 8). This allows reading of data from another

Flash sector after the Erase operation has been suspended. Erase suspend is accepted

only during the Flash Sector Erase instruction execution and defaults to read array

mode. An Erase Suspend instruction executed during an Erase timeout will, in addition to

suspending the erase, terminate the time out.

The Toggle Bit DQ6 stops toggling when the PSD835G2 internal logic is suspended. The

toggle Bit status must be monitored at an address within the Flash sector being erased.

The Toggle Bit will stop toggling between 0.1 碌s and 15 碌s after the Erase Suspend

instruction has been executed. The PSD835G2 will then automatically be set to Read

Flash Block Memory Array mode.

If an Erase Suspend instruction was executed, the following rules apply:

鈥?/div>

Attempting to read from a Flash sector that was being erased will output invalid data.

鈥?/div>

Reading from a Flash sector that was

not

being erased is valid.

鈥?/div>

The Flash memory

cannot

be programmed, and will only respond to Erase Resume

and Reset instructions (read is an operation and is OK).

鈥?/div>

If a Reset instruction is received, data in the Flash sector that was being erased will

be invalid.

9.1.1.9.4 Flash Erase Resume Instruction

If an Erase Suspend instruction was previously executed, the erase operation may be

resumed by this instruction. The Erase Resume instruction consists of writing 030h to any

even address while an appropriate Chip Select (FSi or CSBOOTi) is true. (See Table 8.)

The

PSD835G2

Functional

Blocks

(cont.)

9.1.1.10 Specific Features

9.1.1.10.1 Main Flash and Secondary Flash Sector Protect

Each sector of main Flash and secondary Flash memory can be separately protected

against Program and Erase functions. Sector Protection provides additional data

security because it disables all program or erase operations. This mode can be activated

(or deactivated) through the JTAG-ISP Port or a Device Programmer.

Sector protection can be selected for each sector using the PSDsoft program. This will

automatically protect selected sectors when the device is programmed through the JTAG

Port or a Device Programmer. Flash sectors can be unprotected to allow updating of their

contents using the JTAG Port or a Device Programmer. The microcontroller can read (but

cannot change) the sector protection bits.

Any attempt to program or erase a protected Flash sector will be ignored by the device.

The Verify operation will result in a read of the protected data. This allows a guarantee of

the retention of the Protection status.

The sector protection status can either be read by the MCU through the Flash protection

and secondary Flash protection registers (CSIOP) or use the read sector protection

instruction (Table 8).

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