Advantech PCI-1718 Series Instrukcja Użytkownika Pobierz pdf (Strona 84)

PCI-1718 Series User Manual 76

C.18 FIFO Status — BASE+19H

The register at BASE+19H clears the FIFO buffer and sets its empty flag

(EF). The FIFO status register, address BASE+19H, has flags which you

can read to determine the current state of the FIFO buffer, including full

flag, half-full flag, and empty flag.

EF FIFO empty flag

1 FIFO is empty

0 FIFO is not empty

HF FIFO half-full flag

1 FIFO is half-full or more than half-full

0 FIFO is less than half-full

FF FIFO full flag

1 FIFO is full

0 FIFO is not full

C.19 FIFO Clear — BASE+19H

Writing any value to BASE+19H clears all data in the FIFO and sets the

empty flag (EF) to 1.

Table C.19: Register for FIFO Status

Read FIFO status

Bit # 76543210

BASE + 19H FF HF EF

Table C.20: Register for FIFO Clear

Write FIFO clear

Bit # 76543210

BASE + 19H XXXXXXXX

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 93 94

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Advantech PCI-1718 Series Instrukcja Użytkownika Strona 84