1
4
P
P
L
P
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Notes
1.
2.
X = don’t care.
SDA is left at high-impedance by the microcontroller during the read acknowledge.
23
‘read data’: 8
×
SCL + master acknowledge; note 2
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
X
X
X
X
Ack
0
8
×
SCL; content loaded into interface during previous
acknowledge cycle is shifted out over SDA; MSB is DB7; during
master acknowledge content of DDRAM address 01 is loaded
into the I
2
C-bus interface
X
X
X
X
PHILIPS
24
‘read data’: 8
×
SCL + master acknowledge; note 2
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
1
0
0
‘read data’: 8
×
SCL + no master acknowledge; note 2
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
1
0
0
1
Ack
0
8
×
SCL; code of letter ‘H’ is read first; during master
acknowledge code of ‘I’ is loaded into the I
2
C-bus interface
1
0
0
0
PHILIPS
25
Ack
1
no master acknowledge; after the content of the I
2
C-bus
interface register is shifted out no internal action is performed;
no new data is loaded to the interface register, Data Register
(DR) is not updated, Address Counter (AC) is not incremented
and cursor is not shifted
0
0
1
PHILIPS
26
I
2
C-bus stop
PHILIPS
STEP
INSTRUCTION
DISPLAY
OPERATION