saa1305t NXP Semiconductors, saa1305t Datasheet - Page 11

• Manufacturer Part Number: saa1305t
• Description: Saa1305t On/off Logic Ic
• Manufacturer: NXP Semiconductors

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Philips Semiconductors
I
I
Read mode operations
Only the sequential read mode is possible. The IC starts
after every device select (code 48) to output data 1.
However, in this event the master does acknowledge the
data output and the IC continues to output the next data in
sequence; see Figs 6 and 7.
2004 Jan 15
2
2
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C-BUS INTERFACE COMMANDS
C-bus communication is only possible in the run mode.
On/off logic IC
condition
START
S
DEVICE SELECT
START
acknowledge
R/W
DEVICE SELECT
Fig.6 I
Fig.7 I
byte
DATA 1
2
2
C-bus read mode sequence.
C-bus read data sequence.
acknowledge
STATUS
0
11
To terminate the stream of bytes, the master must not
acknowledge the last byte output, but must generate a
STOP condition. The output data is from consecutive byte
addresses, with the internal byte address counter
automatically incremented after each byte output. In the
event of higher read sequences than available data bytes,
the 7th and 8th bit content are 0 and the address counter
will generate a wrap around (output at address 0).
The definitions of the bits are given in Tables 5, 6 and 7.
OLD
1
NEW
2
3, 4, 5, 6, 7
acknowledge
WATCH
DATA N
STOP
MGR222
no acknowledge
condition
Product specification
STOP
MGR221
SAA1305T
P