Rainbow-electronics MAX6964 Manual do Utilizador descarregar pdf (Página 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

SAAAP0

SLAVE ADDRESS

COMMAND BYTE DATA BYTE

BYTE

AUTOINCREMENT MEMORY ADDRESS

D15 D14 D13 D12 D11 D10 D9 D8 D1 D0D3 D2D5 D4D7 D6

ACKNOWLEDGE FROM MAX6964 ACKNOWLEDGE FROM MAX6964

ACKNOWLEDGE FROM MAX6964

HOW COMMAND BYTE AND DATA BYTE MAP INTO

MAX6964's REGISTERS

R/W

Figure 9. n Data Bytes Received

SAAAP0SLAVE ADDRESS COMMAND BYTE DATA BYTE

BYTE

AUTOINCREMENT MEMORY ADDRESS

D15 D14 D13 D12 D11 D10 D9 D8 D1 D0D3 D2D5 D4D7 D6

ACKNOWLEDGE FROM MAX6964 ACKNOWLEDGE FROM MAX6964

ACKNOWLEDGE FROM MAX6964

HOW COMMAND BYTE AND DATA BYTE MAP INTO

MAX6964's REGISTERS

R/W

Figure 7. Command Byte Received

SAA

0SLAVE 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

123456789

SA6A5A4A3A2A1A0 0 A 0 000000

COMMAND BYTE

1A A AP

START CONDITION

ACKNOWLEDGE FROM SLAVE

ACKNOWLEDGE FROM SLAVE ACKNOWLEDGE FROM SLAVE STOP

CONDITION

O7–O0

O15– O8

DATA1 VALID

DATA2 VALID

SCL

SDA

WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS)

R/W

MSB LSBDATA1 MSB LSBDATA2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 22 23

17-Output LED Driver/GPO 1

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