Rainbow Electronics MAX6964 - Manual (Page 9)

If multiple data bytes are transmitted before a STOP con-
dition is detected, these bytes are generally stored in
subsequent MAX6964 internal registers because the
command byte address autoincrements (
Table 2 ). A
diagram of a write to the output ports registers (blink
phase 0 registers or blink phase 1 registers) is given in
Figure 10 .
Message Format for Reading
The MAX6964 is read using the MAX6964’s internally
stored command byte as an address pointer the same
way the stored command byte is used as an address
pointer for a write. The pointer autoincrements after
each data byte is read using the same rules as for a
write (
Table 2 ). Thus, a read is initiated by first configur-
MAX6964
17-Output LED Driver/GPO
with Intensity Control
_______________________________________________________________________________________ 9
Figure 8. Command and Single Data Byte Received
S A A A P 0 SLAVE ADDRESS COMMAND BYTE DATA BYTE
1
BYTE
AUTOINCREMENT MEMORY ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8 D1 D0 D3 D2 D5 D4 D7 D6
ACKNOWLEDGE FROM MAX 6964 ACKNOWLEDGE FROM MAX 6964
ACKNOWLEDGE FROM MAX 6964
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX 6964 's REGISTERS
R/W
Figure 9. n Data Bytes Received
S A A A P 0 SLAVE ADDRESS COMMAND BYTE DATA BYTE
N
BYTE
AUTOINCREMENT MEMORY ADDRESS
D15 D14 D13 D12 D11 D10 D9 D8 D1 D0 D3 D2 D5 D4 D7 D6
ACKNOWLEDGE FROM MAX 6964 ACKNOWLEDGE FROM MAX 6964
ACKNOWLEDGE FROM MAX 6964
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX 6964 's REGISTERS
R/W
Figure 7. Command Byte Received
S A A P 0 SLAVE ADDRESS COMMAND BYTE
ACKNOWLEDGE FROM MAX6964
D15 D14 D13 D12 D11 D10 D9 D8
COMMAND BYTE IS STORED ON RECEIPT OF
STOP CONDITION
ACKNOWLEDGE FROM MAX6964 R/W
Figure 10. Write Timing Diagram
SLAVE ADDRESS
1 2 3 4 5 6 7 8 9
S A6 A5 A4 A3 A2 A1 A0 0 A 0 0 0 0 0 0 0
COMMAND BYTE
1 A A A P
START CONDITION ACKNOWLEDGE FROM SLAVE ACKNOWLEDGE FROM SLAVE ACKNOWLEDGE FROM SLAVE STOP
CONDITION
O7–O0
O15– O8
DATA1 VALID
DATA2 VALID
t DV
t DV
SCL
SDA
WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS)
R/W
MSB LSB DATA1 MSB LSB DATA2