MCP3464 datasheet(65/108 Pages) MICROCHIP

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DS20006180D-page 65

MCP3461/2/4

6.4

Reading from the Device

When the Command bit, CMD[0], is equal to ‘1’, the

command is a read communication. After the STATUS

byte has been transferred, the first register to be read

on the SDO pin is the one with the address defined by

the Command Address bits (CMD[5:2]).

Any CS rising edge during a read communication

aborts the current reading.

The registers may need 4, 8, 16, 24 or 32 bits to be fully

read, depending on their address (see Table 8-1).

If the CMD[1:0] bits are equal to ‘11’, the command type

is incremental read. In this case, after each register is

read, the Address Pointer is automatically incremented

as long as CS stays logic low. The following data bytes

are read from the next address sequentially defined in

the register map. When the Address Pointer reaches

0xF (last register in the register map for reading), the

next register to read is the register 0x0. See Figure 6-7

for a graphical representation of the address looping.

FIGURE 6-7:

Incremental Read Loop.

If the CMD[1:0] bits are equal to ‘01’, the command

type is static read. In this case, the register address

defined in the COMMAND byte is read continuously.

The Address Pointer is not incremented automatically.

Continuously clocking SCK while CS stays logic low

will continuously read the same register. Reading

another register is only possible by aborting the current

communication sequence by raising CS and issuing

another command.

In both Static and Incremental modes, the registers will

be updated after each register read is fully performed.

If the value of the register changes internally during the

read, it will only be updated after the end of the read.

The value of each register is latched in the SDO Output

Shift register at the first rising edge of SCK of each

individual register reading. Figure 6-8 shows the details,

bit by bit, of a single register read communication.

Figure 6-9 shows the examples of static and incremen-

tal read communications.

CONFIG0 (0x1)

CONFIG1 (0x2)

CONFIG2 (0x3)

CONFIG3 (0x4)

IRQ (0x5)

MUX (0x6)

SCAN (0x7)

TIMER (0x8)

OF FSETCAL (0x9)

GAINCAL (0xA)

Reserved (0xB)

Reserved (0xC)

LOCK (0xD)

Reserved (0xE)

CRCREG (0xF)

ADCDATA (0x0)

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