Rainbow-electronics MAX1329 Manual do Utilizador descarregar pdf (Página 45)

MAX1329/MAX1330

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,

Reference, Voltage Monitors, and Temp Sensor

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Table 10. ADC FIFO Depth Bit

Configuration

AFFD3 AFFD2 AFFD1 AFFD0

ADC FIFO

WORD

DEPTH

WRITE

POINTER

RANGE

0 0 0 0 FIFO disabled

0 0 0 1 2 0-1

0 0 1 0 3 0-2

0 0 1 1 4 0-3

0 1 0 0 5 0-4

0 1 0 1 6 0-5

0 1 1 0 7 0-6

0 1 1 1 8 0-7

1 0 0 0 9 0-8

1 0 0 1 10 0-9

1 0 1 0 11 0-10

1 0 1 1 12 0-11

1 1 0 0 13 0-12

1 1 0 1 14 0-13

1 1 1 0 15 0-14

1 1 1 1 16 0-15

Table 11. ADC FIFO Interrupt-Address Bit

Configuration

AFFI3 AFFI2 AFFI1 AFFI0

ADC FIFO

INTERRUPT

ADDRESS

0000 0

0001 1

0010 2

0011 3

0100 4

0101 5

0110 6

0111 7

1000 8

1001 9

1010 10

1011 11

1100 12

1101 13

1110 14

1111 15

MSB

NAME AFFDATA11 AFFDATA10 AFFDATA9 AFFDATA8 AFFDATA7 AFFDATA6 AFFDATA5 AFFDATA4

DEFAULT 00000000

LSB

NAME AFFDATA3 AFFDATA2 AFFDATA1 AFFDATA0 AFFA3 AFFA2 AFFA1 AFFA0

DEFAULT 00000000

Note: Data length can vary from 1 to 16 words, where a word is 16 bits (12 data bits plus 4 address bits).

Read Format

A single read from the ADC FIFO register returns the

ADC FIFO data and the 4-bit FIFO address (AFFA<3:0>)

corresponding to the location read.

After clocking out the 16-bit word, the read pointer

increments and continual clock shifts out the 16-bit

word at the location pointed to by the ADC FIFO read

pointer. If trying to read from the ADC FIFO at a location

pointed to by the ADC FIFO write pointer, the FIFO

repeats the last ADC conversion result and correspond-

ing ADC FIFO address equivalent to the ADC FIFO

write pointer. To stop reading, bring CS high after

clocking out the 16th bit of a complete word. The read

pointer increments after each complete 16-bit word

read. It does not increment if the read is aborted by

bringing CS high before clocking out all 16 bits. Any

read operation on the ADC FIFO register resets the

interrupt flag (AFF).

AFFDATA<11:0>: ADC FIFO Read Data bits (default =

0000 0000 0000). AFFDATA<11:0> returns the data

written by the ADC at the current read pointer location.

AFFA<3:0>: ADC FIFO Read Address bits (default =

0000). AFFA<3:0> returns the address of the current

read pointer location. AFFA<3:0> is never greater than

the AFFD<3:0> programmed value.

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MAX1329/MAX1330 1

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