Ata6827 [preliminary, Functional description, 1 serial interface – Rainbow Electronics ATA6827 User Manual
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4912C–AUTO–10/06
ATA6827 [Preliminary]
3.
Functional Description
3.1
Serial Interface
Data transfer starts with the falling edge of the CS signal. Data must appear at DI synchronized
to CLK and are accepted on the falling edge of the CLK signal. LSB (bit 0, SRR) has to be trans-
ferred first. Execution of new input data is enabled on the rising edge of the CS signal. When CS
is high, pin DO is in tri-state condition. This output is enabled on the falling edge of CS. Output
data will change their state with the rising edge of CLK and stay stable until the next rising edge
of CLK appears. LSB (bit 0, TP) is transferred first.
Figure 3-1.
Data Transfer
SRR
LS1
HS1
LS2
HS2
LS3
HS3
n. u.
n. u.
n. u.
n. u.
n. u.
n. u.
OCS
n. u.
n. u.
CS
DI
CLK
DO
TP
S1L
S1H
S2L
S2H
S3L
S3H
n. u.
n. u.
n. u.
n. u.
n. u.
n. u.
SCD
OPL
PSF
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Table 3-1.
Input Data Protocol
Bit
Input Register
Function
0
SRR
Status register reset (high = reset; the bits PSF, OPL and SCD in the
output data register are set to low)
1
LS1
Controls output LS1 (high = switch output LS1 on)
2
HS1
Controls output HS1 (high = switch output HS1 on)
3
LS2
See LS1
4
HS2
See HS1
5
LS3
See LS1
6
HS3
See HS1
7
n. u.
Not used
8
n. u.
Not used
9
n. u.
Not used
10
n. u.
Not used
11
n. u.
Not used
12
n. u.
Not used
13
OCS
Overcurrent shutdown (high = overcurrent shutdown is active)
14
n. u.
Not used
15
n. u.
Not used