Data Sheet TLE 6220 GP

V2.1

Page

2007-05-03

10

If the OR operation is programmed it is latched until it is overwritten by the AND operation.

5. HHHH DDDD

- AND operation, and ‘full diagnosis’

With HHHH as the control word, each of the input signals IN1...IN4 are 'AND'ed with the corre-

sponding data bits (DDDD).

&

Output

Driver

IN 1...4

Serial Input,

data bits 0...3

The AND operation implies that the output can be switched off by the SPI data bit input, even if

the corresponding parallel input is in the ON state.

⇒ SPI Priority for OFF-state

This also implies that the serial input data bit can only switch the output channel ON if the cor-

responding parallel input is in the ON state.

If the AND operation is programmed it is latched until it is overwritten by the OR operation.

Control words beside No. 1- 5

All control words except those for Diag Only, Read Back of Inputs, SPI echo, will be accepted as

an OR or an AND command with valid data bits depending on the boolean operation which was

programmed before.

Example 1:

LLHH HLLH: OR operation between parallel inputs and data bits, i.e channel 1 and 4 will be

switched on.

The next command is now: LHHH HHLH

LHHH as command word has no special meaning but it will be accepted as an OR operation and

the data bits will be ORed with the inputs and the outputs 1,3 and 4 will be switched on.

See above: 'If the OR operation is programmed it is latched until it is overwritten by the AND

operation.'

Example 2:

HHHH LLHL means: Data bits will be ANDed with the parallel inputs and the outputs switch ac-

cordingly. Then HLLH HHLH is clocked in: AND was latched by the command before and is now

valid again by using the HLLH command word. So the data bits will be accepted and again

ANDed with the parallel input signals.

See above: 'If the AND operation is programmed it is latched until it is overwritten by the OR

operation.'