CS8405A

22

DS469PP4

8.11

Interrupt 2 Mode MSB (Dh) and Interrupt Mode 2 LSB(Eh)

The two Interrupt Mode registers form a 2-bit code for each Interrupt Register 1 function. There are three ways to

set the INT pin active in accordance with the interrupt condition. In the Rising edge active mode, the INT pin be-

comes active on the arrival of the interrupt condition. In the Falling edge active mode, the INT pin becomes active

on the removal of the interrupt condition. In Level active mode, the INT interrupt pin becomes active during the in-

terrupt condition. Be aware that the active level (Active High or Low) only depends on the INT[1:0] bits. These reg-

isters default to 00.

00 - Rising edge active

01 - Falling edge active

10 - Level active

11 - Reserved

8.12

Channel Status Data Buffer Control (12h)

BSEL - Selects the data buffer register addresses to contain User data or Channel Status data

Default = ‘0’

0 - Data buffer address space contains Channel Status data

1 - Data buffer address space contains User data

Note:

There are separate complete buffers for the Channel Status and User bits. This control bit determines which

buffer appears in the address space.

EFTCI - E to F C-data buffer transfer inhibit bit.

Default = ‘0’

0 - Allow C-data E to F buffer transfers

1 - Inhibit C-data E to F buffer transfers

CAM - C-data buffer control port access mode bit

Default = ‘0’

0- Onebytemode

1- Twobytemode

7

6

5

43210

0

0

0

0

0

EFTU1

0

0

0

0

0

0

0

EFTU0

0

0

7

6

5

43210

0

0

BSEL

0

0

EFTCI

CAM

0