"ST-M95040-R： 2 Kbit SPI通讯方式外置EEPROM"

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Signal description M950x0-W M950x0-R M950x0-DF

8/46 DocID6512 Rev 13

2 Signal description

During all operations, V

must be held stable and within the specified valid range:

(min) to V

(max).

All of the input and output signals can be held high or low (according to voltages of V

, V

or V

, as specified in Table 16: DC characteristics (M950x0-W, device grade 6) and

Table 17: DC characteristics (M950x0-R or M95040-DF, device grade 6). These signals are

described next.

2.1 Serial Data Output (Q)

This output signal transfers data serially out of the device. Data is shifted out on the falling

edge of Serial Clock (C).

2.2 Serial Data Input (D)

This input signal transfers data serially into the device. It receives instructions, addresses,

and the data to be written. Values are latched on the rising edge of Serial Clock (C).

2.3 Serial Clock (C)

This input signal provides the timing of the serial interface. Instructions, addresses, or data

present at Serial Data Input (D) are latched on the rising edge of Serial Clock (C). Data on

Serial Data Output (Q) changes after the falling edge of Serial Clock (C).

2.4 Chip Select (S)

When this input signal is high, the device is deselected and Serial Data Output (Q) is at high

impedance. Unless an internal Write cycle is in progress, the device will be in the Standby

Power mode. Driving Chip Select (

S) low selects the device, placing it in the Active Power

mode.

After Power-up, a falling edge on Chip Select (S) is required prior to the start of any

instruction.

2.5 Hold (HOLD)

The Hold (HOLD) signal is used to pause any serial communications with the device without

deselecting the device.

During the Hold condition, the Serial Data Output (Q) is high impedance, and Serial Data

Input (D) and Serial Clock (C) are Don’t Care.

To start the Hold condition, the device must be selected, with Chip Select (S) driven low.

DocID6512 Rev 13 9/46

M950x0-W M950x0-R M950x0-DF Signal description

2.6 Write Protect (W)

This input signal controls whether the memory is write protected. When Write Protect (W) is

held low, writes to the memory are disabled, but other operations remain enabled.

Write Protect (W) must either be driven high or low, but must not be left floating.

2.7 V

ground

is the reference for the V

supply voltage.

2.8 Supply voltage (V

)

2.8.1 Operating supply voltage (V

)

Prior to selecting the memory and issuing instructions to it, a valid and stable V

voltage

within the specified [V

(min), V

(max)] range must be applied (see Table 9: Operating

conditions (M950x0-W), Table 10: Operating conditions (M950x0-R) and Table 11:

Operating conditions (M95040-DF, device grade 6)). This voltage must remain stable and

valid until the end of the transmission of the instruction and, for a Write instruction, until the

completion of the internal write cycle (t

In order to secure a stable DC supply voltage, it is recommended to decouple the V

line

with a suitable capacitor (usually of the order of 10 nF to 100 nF) close to the V

package pins.

2.8.2 Device reset

In order to prevent inadvertent write operations during power-up, a power-on-reset (POR)

circuit is included. At power-up, the device does not respond to any instruction until V

reaches the internal reset threshold voltage (this threshold is defined in

Table 9: Operating

conditions (M950x0-W), Table 10: Operating conditions (M950x0-R) and Table 11:

Operating conditions (M95040-DF, device grade 6) as V

RES

When V

passes over the POR threshold, the device is reset and is in the following state:

• Standby Power mode

• Deselected (note that, to be executed, an instruction must be preceded by a falling

edge on Chip Select (S

))

• Status register value:

– Write Enable Latch (WEL) is reset to 0

– Write In Progress (WIP) is reset to 0

– SRWD, BP1 and BP0 bits remain unchanged (non-volatile bits)

When the device is in the above state, it must not be accessed until V

reaches a valid and

stable V

voltage within the specified [V

(min), V

(max)] range defined in Table 9:

Operating conditions (M950x0-W), Table 10: Operating conditions (M950x0-R) and

Table 11: Operating conditions (M95040-DF, device grade 6).

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"ST-M95040-R： 2 Kbit SPI通讯方式外置EEPROM"

simatic-st70n-complete-english-2020.pdf

SDI SMPTE 425M标准

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STM32、Cortex-A、Cortex-R、Cortex-M、SecurCore

FT:M->IR PC+1->PC ST: SP->MAR M->MAR->C SP+1->SP DT:R0->MAR ET:C->MDR MDR->M PC->MAR

它的取址流程为FT:M->IR PC+1->PC ST: SP->MAR M->MAR->C SP+1->SP DT:R0->MAR ET:C->MDR MDR->M PC->MAR

MOV R2,(PC)+的取址流程为 请你复述 FT:M->IR PC+1->PC ST: SP->MAR M->MAR->C SP+1->SP DT:R0->MAR ET:C->MDR MDR->M PC->MAR 不需要解释意思

仿写 Linux 下的 ls-l 命令

st7565r stm32

printf("\033[32;0H"); printf("\r\e[K"); printf("\e[0m"); printf("\033[32;10H"); printf("\e[1;32m SAMPLING TIME : %d ms \n", st); printf("\033[32;40H"); printf("\e[1;32m TIME INTERVAL : %d s \n", ti); printf("\033[32;80H"); printf("\e[1;31m EXIT AND SAVE SET \033[?25l \n");

printf("\033[32;0H"); printf("\r\e[K"); printf("\e[0m"); printf("\033[32;10H"); printf("\e[1;31m SAMPLING TIME : %d ms \n", st); printf("\033[32;40H"); printf("\e[1;32m TIME INTERVAL : %d s \n", ti); printf("\033[32;80H"); printf("\e[1;32m EXIT AND SAVE SET \033[?25l \n");

printf("\033[32;0H"); printf("\r\e[K"); printf("\e[0m"); printf("\033[32;10H"); printf("\e[1;32m SAMPLING TIME : %d ms \n", st); printf("\033[32;40H"); printf("\e[1;31m TIME INTERVAL : %d s \n", ti); printf("\033[32;80H"); printf("\e[1;32m EXIT AND SAVE SET \033[?25l \n");

printf("\033[32;0H"); printf("\r\e[K"); printf("\e[0m"); printf("\033[32;10H"); printf("\e[1;32m PATTERN : SET_PAR \n"); printf("\033[32;40H"); printf("\e[1;32m SAMPLING TIME : %d ms \n", st); printf("\033[32;80H"); printf("\e[1;32m TIME INTERVAL : %d s \033[?25l \n", ti);

printf("\033[32;0H"); printf("\r\e[K"); printf("\e[0m"); printf("\033[32;10H"); printf("\e[1;32m PATTERN : %s \n", pattern); printf("\033[32;40H"); printf("\e[1;32m SAMPLING TIME : %d ms \n", st); printf("\033[32;80H"); printf("\e[1;32m TIME INTERVAL : %d s \033[?25l \n", ti);

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写出下列指令在模型机上的读取和执行流程，并指出该指令中源操作数的寻址方式分别是什么？ （1）MOV (R0)+, R1 FT0 PC—>MAR FT1 M—>MDR—>IR, PC+1—>PC ST0 R1—>C DT0 R0—>MAR DT1 R0+1—>Z DT2 Z—>R0 ET0 C—>MDR ET1 MDR—>M （2）INC -(R2)

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MOV R2,(PC)+的取址流程为请你复述 FT:M->IR PC+1->PC ST: SP->MAR M->MAR->C SP+1->SP DT:R0->MAR ET:C->MDR MDR->M PC->MAR 不需要解释意思

写出下列指令在模型机上的读取和执行流程，并指出该指令中源操作数的寻址方式分别是什么？（1）MOV (R0)+, R1 FT0 PC—>MAR FT1 M—>MDR—>IR, PC+1—>PC ST0 R1—>C DT0 R0—>MAR DT1 R0+1—>Z DT2 Z—>R0 ET0 C—>MDR ET1 MDR—>M （2）INC -(R2)