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| 型號(hào)： | MR80C52TXXX-20/883D |
| 廠(chǎng)商： | ATMEL CORP |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁(yè)數(shù)： | 299/416頁(yè) |
| 文件大?。?/td> | 10516K |
| 代理商： | MR80C52TXXX-20/883D |
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402
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
29.10.3 Reload User Configuration Wait State
The user may change any of the configuration parameters by writing the SMC user interface.
When detecting that a new user configuration has been written in the user interface, the SMC inserts a wait state before
starting the next access. The so called “Reload User Configuration Wait State” is used by the SMC to load the new set of
parameters to apply to next accesses.
The Reload Configuration Wait State is not applied in addition to the Chip Select Wait State. If accesses before and after
re-programming the user interface are made to different devices (Chip Selects), then one single Chip Select Wait State is
applied.
On the other hand, if accesses before and after writing the user interface are made to the same device, a Reload
Configuration Wait State is inserted, even if the change does not concern the current Chip Select.
29.10.3.1 User Procedure
To insert a Reload Configuration Wait State, the SMC detects a write access to any SMC_MODE register of the user
interface. If the user only modifies timing registers (SMC_SETUP, SMC_PULSE, SMC_CYCLE registers) in the user
interface, he must validate the modification by writing the SMC_MODE, even if no change was made on the mode
parameters.
The user must not change the configuration parameters of an SMC Chip Select (Setup, Pulse, Cycle, Mode) if accesses
are performed on this CS during the modification. Any change of the Chip Select parameters, while fetching the code
from a memory connected on this CS, may lead to unpredictable behavior. The instructions used to modify the
parameters of an SMC Chip Select can be executed from the internal RAM or from a memory connected to another CS.
29.10.3.2 Slow Clock Mode Transition
A Reload Configuration Wait State is also inserted when the Slow Clock Mode is entered or exited, after the end of the
current transfer (see “Slow Clock Mode” on page 413).
29.10.4 Read to Write Wait State
Due to an internal mechanism, a wait cycle is always inserted between consecutive read and write SMC accesses.
This wait cycle is referred to as a read to write wait state in this document.
This wait cycle is applied in addition to chip select and reload user configuration wait states when they are to be inserted.
29.11 Data Float Wait States
Some memory devices are slow to release the external bus. For such devices, it is necessary to add wait states (data
float wait states) after a read access:
before starting a read access to a different external memory
before starting a write access to the same device or to a different external one.
The Data Float Output Time (tDF) for each external memory device is programmed in the TDF_CYCLES field of the
SMC_MODE register for the corresponding chip select. The value of TDF_CYCLES indicates the number of data float
wait cycles (between 0 and 15) before the external device releases the bus, and represents the time allowed for the data
output to go to high impedance after the memory is disabled.
Data float wait states do not delay internal memory accesses. Hence, a single access to an external memory with long
tDF will not slow down the execution of a program from internal memory.
The data float wait states management depends on the READ_MODE and the TDF_MODE fields of the SMC_MODE
register for the corresponding chip select.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MQ83C154CXXX-20P883D | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
| MR80C32-36/883R | 8-BIT, 36 MHz, MICROCONTROLLER, CQCC44 |
| MR80C154U-36:D | MICROCONTROLLER |
| MR80C52TXXX-30SBD | 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQCC44 |
| MQ80C52EXXX-36/883D | 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MR80C86 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:Microprocessor, 16 Bit, 44 Pin, Ceramic, LCC |
| MR80C86-2 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86-2/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MR80C86-2/B | 制造商:Intersil Corporation 功能描述:MPU 80C86 16BIT CMOS 8MHZ 44PLCC - Rail/Tube |
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