參數(shù)資料
型號: M95160-R
廠商: 意法半導(dǎo)體
元件分類: DRAM
英文描述: 16 Kbit and 8 Kbit serial SPI bus EEPROM with high speed clock
中文描述: 16千位和8千位串行SPI高速時鐘總線的EEPROM
文件頁數(shù): 10/45頁
文件大?。?/td> 270K
代理商: M95160-R
Connecting to the SPI bus
M95160, M95080
10/45
3
Connecting to the SPI bus
These devices are fully compatible with the SPI protocol.
All instructions, addresses and input data bytes are shifted in to the device, most significant
bit first. The Serial Data Input (D) is sampled on the first rising edge of the Serial Clock (C)
after Chip Select (S) goes Low.
All output data bytes are shifted out of the device, most significant bit first. The Serial Data
Output (Q) is latched on the first falling edge of the Serial Clock (C) after the instruction
(such as the Read from Memory Array and Read Status Register instructions) have been
clocked into the device.
Figure 4.
shows three devices, connected to an MCU, on an SPI bus. Only one device is
selected at a time, so only one device drives the Serial Data Output (Q) line at a time, all the
others being high impedance.
Figure 4.
Bus master and memory devices on the SPI bus
1.
Figure 4
shows an example of three memory devices connected to an MCU, on an SPI bus.
Only one memory device is selected at a time, so only one memory device drives the Serial
Data Output (Q) line at a time, the other memory devices are high impedance.
The Write Protect (W) and Hold (HOLD) signals should be driven, High or Low as appropriate.
The pull-up resistor R (represented in
Figure 4
) ensures that a device is not selected if the
Bus Master leaves the S line in the high impedance state.
In applications where the Bus Master may be in a state where all input/output SPI buses are
high impedance at the same time (for example, if the Bus Master is reset during the
transmission of an instruction), the clock line (C) must be connected to an external pull-
down resistor so that, if all inputs/outputs become high impedance, the C line is pulled Low
(while the S line is pulled High): this ensures that S and C do not become High at the same
time, and so, that the t
SHCH
requirement is met. The typical value of R is 100 k
.
AI12836b
SPI Bus Master
SPI Memory
Device
SDO
SDI
SCK
C
Q
D
S
SPI Memory
Device
C
Q
D
S
SPI Memory
Device
C
Q
D
S
CS3
CS2 CS1
SPI Interface with
(CPOL, CPHA) =
(0, 0) or (1, 1)
W
HOLD
W
HOLD
W
HOLD
R
R
R
V
CC
V
CC
V
CC
V
CC
V
SS
V
SS
V
SS
V
SS
R
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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