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STM32F427AI bảng dữ liệu(PDF) 175 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  ARM Cortex-M4 32b MCUFPU, 225DMIPS, up to 2MB Flash/2564KB RAM, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera & LCD-TFT
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32F427AI bảng dữ liệu(HTML) 175 Page - STMicroelectronics

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STM32F427xx STM32F429xx
Electrical characteristics
197
Synchronous waveforms and timings
Figure 59 through Figure 62 represent synchronous waveforms and Table 94 through
Table 97 provide the corresponding timings. The results shown in these tables are obtained
with the following FMC configuration:
•
BurstAccessMode = FMC_BurstAccessMode_Enable;
•
MemoryType = FMC_MemoryType_CRAM;
•
WriteBurst = FMC_WriteBurst_Enable;
•
CLKDivision = 1; (0 is not supported, see the STM32F4xx reference manual : RM0090)
•
DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM
In all timing tables, the THCLK is the HCLK clock period (with maximum
FMC_CLK = 90 MHz).
Table 93. Asynchronous multiplexed PSRAM/NOR write-NWAIT timings(1)(2)
1. CL = 30 pF.
2. Guaranteed by characterization results.
Symbol
Parameter
Min
Max
Unit
tw(NE)
FMC_NE low time
9THCLK
9THCLK+0.5
ns
tw(NWE)
FMC_NWE low time
7THCLK
7THCLK+2
ns
tsu(NWAIT_NE)
FMC_NWAIT valid before FMC_NEx high
6THCLK+1.5
-
ns
th(NE_NWAIT)
FMC_NEx hold time after FMC_NWAIT
invalid
4THCLK–1
-
ns



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