MCP3564-ESLASHST datasheet(65/108 Pages) MICROCHIP

65 / 108 page

 2019-2021 Microchip Technology Inc.

DS20006181C-page 65

MCP3561/2/4

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

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 regis-

ter map for reading), the next register to read is register

0x0 (see Figure 6-6 for a graphical representation of

the address looping).

FIGURE 6-6:

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 automatically incremented.

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

are 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 6-7 shows the

bit by bit details of a single register Read

communication. Figure 6-8 shows the examples of

Static and Incremental 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)

MCP3564-E/ST 数据表(PDF) 65 Page - Microchip Technology

MCP3564-E/ST 数据表(HTML) 65 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载