參數(shù)資料
型號: PSD813FH
英文描述: Field Programmble Microcontroller Peripherals With Flash Memory(帶閃存的現(xiàn)場可編程微控制器)
中文描述: 場可編程微控制器外圍設(shè)備與快閃記憶體(帶閃存的現(xiàn)場可編程微控制器)
文件頁數(shù): 77/83頁
文件大?。?/td> 369K
代理商: PSD813FH
Prelimnary
PSD813FN/FH
77
Device Operation
(cont.)
Memory Sectors
The sectors of the Flash Memory are shown in Figure 1. The memory array is divided into
8 sectors of 64K bytes. Each sector can be erased separately or any combination of sectors
can be erased simultaneously. The Sector Erase operation is managed automatically by the
P/E.C. The operation can be suspended in order to read from any another sector, and then
resumed.
Operations
Operations are defined as specific bus cycles and signals which allow Memory Read,
Command Write, Output Disable, Standby, Read Status Bits, and Electronic Signature
Read. They are shown in Tables 1 and 2.
J
Read
Read operations are used to output the contents of the Memory Array, the Status
Register or the Electronic Signature. Both Chip Enable CSF and Output Enable RDF
must be low in order to read the output of the memory. The Chip Enable input also
provides power control and should be used for device selection. Output Enable should
be used to gate data onto the output independent of the device selection. The data
read depends on the previous command written to the memory (see instructions RST
and RSIG, and Status Bits).
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Write
Write operations are used to give Instruction Commands to the memory or to latch
input data to be programmed. A write operation is initiated when Chip Enable CSF is
Low and Write Enable WRF is Low with Output Enable RDF High. Addresses are
latched on the falling edge of WRF or CSF whichever occurs last. Commands and
Input Data are latched on the rising edge of WRF or CSF whichever occurs first.
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Output Dsable
The data outputs are high impedance when the Output Enable RDF is High with Write
Enable WRF High.
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Standby
The memory is in standby when Chip Enable CSF is High and Program/Erase Controller
P/E.C. is Idle. The power consumption is reduced to the standby level and the outputs
are high impedance, independent of the Output Enable RDF or Write Enable WRF
inputs.
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Automatic Standby
After 150 ns of inactivity and when CMOS levels are driving the addresses, the chip
automatically enters a pseudo standby mode where power consumption is reduced to
the CMOS standby value, while outputs are still driving the bus.
Appendix A –
Flash Memory
(cont.)
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