MCP47FVB21 datasheet(56/92 Pages) MICROCHIP

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MCP48FEBXX

DS20005429B-page 56

 2015 Microchip Technology Inc.

7.0.1

COMMAND BYTE

The command byte has three fields: the address, the

command, and one data bit (see Figure 7-1). Currently

only one of the data bits is defined (D8). This is for the

Write

command.

The device memory is accessed when the master

sends a proper command byte to select the desired

operation. The memory location getting accessed is

contained in the command byte’s AD4:AD0 bits. The

action desired is contained in the command byte’s

C1:C0 bits, see Table 7-2. C1:C0 determines if the

desired memory location will be read, written, enabled

or disabled.

As the command byte is being loaded into the device

(on the SDI pin), the device’s SDO pin is driving. The

SDO pin will output high bits for the first seven bits of

that command. On the 8th bit, the SDO pin will output

the CMDERR bit state (see Section 7.0.3 “Error

Condition”

7.0.2

DATA BYTES

Data bytes are only present in the

Read

and the

Write

commands. These commands concatenate the

two data bytes after the command byte, for a 24-bit

long command (see Figure 7-1).

TABLE 7-2:

COMMAND BIT OVERVIEW

FIGURE 7-1:

8-BitSPI CommandFormat.

FIGURE 7-2:

24-bit SPI Command Format.

C1:C0

Bit

States

Command

# of

Bits

Normal or HV

Read Data

24-Bits Normal

Write Data

24-Bits Normal

Enable (1)

8-Bits

HV Only

Disable (1)

8-Bits

HV Only

Note 1:

High

Voltage

enable

and

disable

commands on select nonvolatile memory

locations.

Memory

Command Byte

Address

Command

Bits

0 0 = Write Data

0 1

= Disable (1)

1 0

= Enable (1)

1 1 = Read Data

C C

1 0

Command

Bits

8-bit Command

Note 1:

This command uses the 8-bit format.

Memory

24-bit Command

Data Bits (8-, 10-, or 12-bits)

Address

Command

Bits

0 0

= Write Data (1)

0 1 = Disable

1 0 = Enable

1 1

= Read Data (1)

C C

1 0

Command

Bits

Command Byte

Data Word (2 Bytes)

Note 1:

This command uses the 24-bit format.

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