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| 型号： | M25P16-VMW6TG |
| 厂商： | 意法半导体 |
| 元件分类： | DRAM |
| 英文描述： | 4 Mbit Uniform Sector, Serial Flash Memory |
| 中文描述： | 4兆位统一部门，串行闪存 |
| 文件页数： | 10/55页 |
| 文件大小： | 335K |
| 代理商： | M25P16-VMW6TG |
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SPI modes
M25P16
10/55
3
SPI modes
These devices can be driven by a microcontroller with its SPI peripheral running in either of
the two following modes:
CPOL=0, CPHA=0
CPOL=1, CPHA=1
●
●
For these two modes, input data is latched in on the rising edge of Serial Clock (C), and
output data is available from the falling edge of Serial Clock (C).
The difference between the two modes, as shown in
Figure 5
, is the clock polarity when the
bus master is in Stand-by mode and not transferring data:
C remains at 0 for (CPOL=0, CPHA=0)
C remains at 1 for (CPOL=1, CPHA=1)
●
●
Figure 4.
Bus master and memory devices on the SPI bus
1.
Figure 4
shows an example of 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, the other devices are high impedance. Resistors R (represented in
Figure 4
) ensure
that the M25P16 is not selected if the Bus Master leaves the S line in the high impedance
state. As the Bus Master may enter a state where all inputs/outputs are in high impedance
at the same time (for example, when the Bus Master is reset), the clock line (C) must be
connected to an external pull-down resistor so that, when all inputs/outputs become high
impedance, the S line is pulled High while the C line is pulled Low (thus ensuring 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
, assuming that the time constant R*C
p
(C
p
= parasitic
capacitance of the bus line) is shorter than the time during which the Bus Master leaves the
SPI bus in high impedance.
The Write Protect (W) and Hold (HOLD) signals should be driven, High or Low as appropriate.
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
相关PDF资料 |
PDF描述 |
|---|---|
| M25P16-VMW6TP | 4 Mbit Uniform Sector, Serial Flash Memory |
| M25P16-VME3G | 4 Mbit Uniform Sector, Serial Flash Memory |
| M25P16-VME3P | 4 Mbit Uniform Sector, Serial Flash Memory |
| M25P16-VME3TG | 4 Mbit Uniform Sector, Serial Flash Memory |
| M25P16-VME3TP | 4 Mbit Uniform Sector, Serial Flash Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M25P16-VMW6TP | 制造商:NUMONYX 制造商全称:Numonyx B.V 功能描述:16 Mbit, serial Flash memory, 75 MHz SPI bus interface |
| M25P16-VMW6YG | 制造商:Micron Technology Inc 功能描述:16 MBIT, SERIAL FLASH MEMORY, 75 MHZ SPI BUS INTERFACE - Trays |
| M25P20 | 制造商:NUMONYX 制造商全称:Numonyx B.V 功能描述:2 Mbit, low voltage, Serial Flash memory with 50MHz SPI bus interface |
| M25P20-AV3D11 | 制造商:Micron Technology Inc 功能描述:2MX1 NOR FLASH DIE-COM AUTOMOTIVE TEMP 3.0V - Trays |
| M25P20-ESU21/90 | 制造商:Micron Technology Inc 功能描述:SERIAL NOR - Gel-pak, waffle pack, wafer, diced wafer on film |
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