User's Manual

COUNTER CONFIGURATION

BADR3 + 13 hex

READ/WRITE

D0D1D2D3D4D5D6D7

01234567

This register is used to set the operating modes of each of the 82C54’s counters.

Configure the counters by writing mode information to the Configure register,

followed by the count information written to the specific counter (data) registers.

Refer to the Celeritous 82C54 data sheets for more detailed information.

5.4.6 8255 Interrupt Source Configure

BADR3 + 14 hex

READ/WRITE

AIRQ0AIRQ1BIRQ0BIRQ1CIRQ0CIRQ1DIRQ0DIRQ1

01234567

DIRQ1 When this bit is set, the 8255 in Group 3 will generate an interrupt on

INTRB if INTEN in BASE +15 hex is also set.

DIRQ0 When this bit is set, the 8255 in Group 3 will generate an interrupt on

INTRA if INTEN in BASE +15 hex is also set.

CIRQ1 When this bit is set, the 8255 in Group 2 will generate an interrupt on

INTRB if INTEN in BASE +15 hex is also set.

CIRQ0 When this bit is set, the 8255 in Group 2 will generate an interrupt on

INTRA if INTEN in BASE +15 hex is also set.

BIRQ1 When this bit is set, the 8255 in Group 1 will generate an interrupt on

INTRB if INTEN in BASE +15 hex is also set.

BIRQ0 When this bit is set, the 8255 in Group 1 will generate an interrupt on

INTRA if INTEN in BASE +15 hex is also set.

AIRQ1 When this bit is set, the 8255 in Group 0 will generate an interrupt on

INTRB if INTEN in BASE +15 hex is also set.

AIRQ0 When this bit is set, the 8255 in Group 0 will generate an interrupt on

INTRA if INTEN in BASE +15 hex is also set.