MCP4142T-103ESLASHMS datasheet(51/88 Pages) MICROCHIP

51 / 88 page

DS22059B-page 51

MCP414X/416X/424X/426X

7.6

Read Data

Normal and High Voltage

The Read command is a 16-bit command. The Read

Command can be issued to both the Volatile and

Non-Volatile memory locations. The format of the

command is shown in Figure 7-4.

The first 6-bits of the Read command determine the

address and the command. The 7th clock will output

the CMDERR bit on the SDO pin. The remaining

9-clocks the device will transmit the 9 data bits (D8:D0)

of the specified address (AD3:AD0).

Figure 7-4 shows the SDI and SDO information for a

Read command.

During a write cycle (Write or High Voltage Write to a

Non-Volatile memory location) the Read command can

only read the Volatile memory locations. By reading the

Status Register (04h), the Host Controller can

determine when the write cycle has completed (via the

state of the EEWA bit).

7.6.1

SINGLE READ

The read operation requires that the CS pin be in the

active state (VILor VIHH). Typically, the CS pin will be in

the inactive state (VIH) and is driven to the active state

(VILor VIHH). The 16-bit Read Command (Command

Byte and Data Byte) is then clocked in on the SCK and

SDI pins. The SDO pin starts driving data on the 7th bit

(CMDERR bit) and the addressed data comes out on

the 8th through 16th clocks. Figure 6-3 through

Figure 6-6 show possible waveforms for a single read.

Figure 6-5 and Figure 6-6 show the single read

waveforms when the SDI and SDO signals are

multiplexed on the same pin. For additional information

on the multiplexing of these signals, refer to

Section 6.1.3 “SDI/SDO”

FIGURE 7-4:

Read Command - SDI and SDO States.

XXXXXXXXXX

1111111

Valid Address/Command combination

1111110000000000 Attempted Non-Volatile Memory Read

during Non-Volatile Memory Write Cycle

COMMAND BYTE

DATA BYTE

SDI

SDO

READ DATA

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