MCP47FVB01 datasheet(31/92 Pages) MICROCHIP

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DS20005429B-page 31

MCP48FEBXX

4.2

Device Memory

User memory includes three types of memory:

• Volatile Register Memory (RAM)

• Nonvolatile Register Memory

• Device Configuration Memory

Each memory address is 16 bits wide. There are five

nonvolatile user-control bits that do not reside in

memory mapped register space (see Section 4.2.3

“Device Configuration Memory”

4.2.1

VOLATILE REGISTER MEMORY

(RAM)

There are up to six volatile memory locations:

• DAC0 and DAC1 Output Value Registers

• VREF Select Register

• Power-Down Configuration Register

• Gain and Status Register

• WiperLock Technology Status Register

The volatile memory starts functioning when the

device VDD is at (or above) the RAM retention voltage

(VRAM). The volatile memory will be loaded with the

default device values when the VDD rises across the

VPOR/VBOR voltage trip point.

4.2.2

NONVOLATILE REGISTER

MEMORY

This memory can be grouped into two uses of

nonvolatile memory. These are the DAC Output Value

and Configuration registers:

• Nonvolatile DAC0 and DAC1 Output Value

Registers

• Nonvolatile VREF Select Register

• Nonvolatile Power-Down Configuration Register

• Nonvolatile Gain Register

The nonvolatile memory starts functioning below the

device’s VPOR/VBOR trip point, and is loaded into the

corresponding volatile registers whenever the device

rises above the POR/BOR voltage trip point.

The device starts writing the EEPROM memory

location at the completion of the serial interface

command. For the SPI interface, this is when the CS

pin goes inactive (VIH).

The nonvolatile DAC registers enable stand-alone

operation of the device (without Microcontroller control)

after being programmed to the desired value.

Note:

When the nonvolatile memory is written,

the corresponding volatile memory is not

modified.

TABLE 4-1:

MEMORY MAP (x16)

Function

00h Volatile DAC0 Register

CL0

10h Nonvolatile DAC0 Register

DL0

01h Volatile DAC1 Register

CL1

11h

Nonvolatile DAC1 Register

DL1

02h Reserved

—

12h Reserved

—

03h Reserved

—

13h Reserved

—

04h Reserved

—

14h Reserved

—

05h Reserved

—

15h Reserved

—

06h Reserved

—

16h Reserved

—

07h Reserved

—

17h Reserved

—

08h VREF Register

—

18h Nonvolatile VREF Register

—

09h Power-Down Register

—

19h Nonvolatile Power-Down Register

—

0Ah Gain and Status Register

—

1Ah NV Gain Register

—

0Bh WiperLock™ Technology Status Register

—

1Bh Reserved

—

0Ch Reserved

—

1Ch Reserved

—

0Dh Reserved

—

1Dh Reserved

—

0Eh Reserved

—

1Eh Reserved

—

0Fh Reserved

—

1Fh Reserved

—

Volatile Memory address range

Nonvolatile Memory address range

Note 1:

Device Configuration Memory bits require a High-Voltage enable or disable command (LAT/LAT0 = VIHH,

or CS = VIHH) to modify the bit value.

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