MCP48CMB21 datasheet(73/106 Pages) MICROCHIP

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 2019 Microchip Technology Inc.

DS20006160A-page 73

MCP48CXBXX

7.6

Read Command

The Read command is a 24-bit command. The Read

command can be issued to both the volatile and

nonvolatile memory locations. The format of the

command is shown in Figure 7-4.

The first 7 bits of the Read command determine the

address and the command. The 8th clock will output

the CMDERR bit on the SDO pin. For the remaining 16

clocks, the device will transmit the data bits of the

specified address (AD4:AD0).

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

Read command.

During an MTP write cycle, the Read command can

only be issued to the volatile memory locations. By

reading the Status register, the Host Controller can

determine when the write cycle has been completed

(via the state of the MTPMA bit).

7.6.1

SINGLE READ

The read operation requires that the CS pin be in the

Active state (VIL). Typically, the CS pin will be in the

Inactive state (VIH) and is driven to the Active state

(VIL). The 24-bit Read command (Command Byte and

Data Word) is then clocked in on the SCK and SDI pins.

The SDO pin starts driving high (VIH) when the CS goes

active and starts driving data on the 8th bit (CMDERR

bit); the addressed data comes out on the 9th through

24th clocks.

FIGURE 7-4:

Read Single Memory Location Command - SDI and SDO States.

12-bit data

10-bit data

8-bit data

SDI

SDO

dd Valid(1)

0 Invalid(2)

Note 1: The Data bits depend on the resolution of the device: 12-bit = D11:D00,

10-bit = D09:D00, and 8-bit = D07:D00.

The unimplemented bits are output as ‘0’ and data are right justified for easy Host Controller

operation (no data manipulation after reading the register value).

2: If an Error Condition occurs (CMDERR = ‘0’), all the following SDO bits will be output as ‘0’

until the CMDERR condition is cleared (the CS pin is forced to the Inactive state).

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