MCP47FVB01 datasheet(55/92 Pages) MICROCHIP

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DS20005429B-page 55

MCP48FEBXX

7.0

SPI COMMANDS

This section documents the commands that the device

supports.

The MCP48FEBXX’s SPI command format supports

32 memory address locations and four commands.

Commands may have two modes. These are:

• Normal Serial Commands

• High-Voltage Serial Commands

The four commands are:

• Write command (C1:C0 = ‘00’)

• Read command (C1:C0 = ‘11’)

• Commands to Modify the Device Configuration

Bits:

(HVC = VIHH)

- Enable Configuration Bit (C1:C0 = ‘10’)

- Disable Configuration Bit (C1:C0 = ‘01’)

The supported commands are shown in Table 7-1. These

commands allow for both single data or continuous data

operation. Table 7-1 also shows the required number of

bit clocks for each command’s different mode of

operation.

Normal Serial commands are those where the HVC

pin is driven to either VIH or VIL. With High-Voltage

Serial commands, the HVC pin is driven to VIHH.

The 8-bit commands (see Figure 7-1) are used to

modify

the

device

Configuration

bits

(Enable

Configuration Bit

and Disable Configuration Bit),

while the 24-bit commands (see Figure 7-2) are used

to read and write to the device registers (Read

Command

and Write Command). These commands

contain a Command Byte and two Data Bytes.

Table 7-2 shows an overview of all the SPI commands

and their interaction with other device features.

TABLE 7-1:

SPI COMMANDS - NUMBER OF CLOCKS

Command

# of Bit

Clocks

(2)

Data Update Rate

(8-bit/10-bit/12-bit)

(Data Words/Second)

Comments

Operation

Code

Mode(1)

@ 1 MHz @ 10 MHz @ 20 MHz(3)

Write Command

No(3) Single

41,666

416,666

833,333

No(3) Continuous

24 * n

41,666

416,666

833,333

For 10 data words

Read Command (4)

No(3) Single

41,666

416,666

833,333

No(3) Continuous

24 * n

41,666

416,666

833,333

For 10 data words

Enable Configuration

Bit

Command

Yes Single

125,000 1,250,000 2,500,000

Yes Continuous

8 * n

125,000 1,250,000 2,500,000 For 10 data words

Disable Configuration

Bit

Command

Yes Single

125,000 1,250,000 2,500,000

Yes Continuous

8 * n

125,000 1,250,000 2,500,000 For 10 data words

Note 1:

Nonvolatile registers can only use the “Single” mode.

“n” indicates the number of times the command operation is to be repeated.

If the state of the HVC pin is VIHH, then the command is ignored, but a Command Error condition

(CMDERR) will NOT be generated.

This command is useful to determine when an EEPROM programming cycle has completed.

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