Rainbow-electronics MAX7470 Manual do Utilizador descarregar pdf (Página 13)

MAX7469/MAX7470

HDTV Continuously Variable

Anti-Aliasing Filters

______________________________________________________________________________________

write sequence must be repeated. Figures 6 and 7

show examples of write sequences.

Read Cycle

In read mode (R/W = 1), the MAX7469/MAX7470 write

the contents of the control/status or frequency registers

to the bus. When the command byte indicates a read

operation of either the control/status or the frequency

follow the command byte. After sending an Sr, the mas-

ter sends the MAX7469/MAX7470 slave address byte

followed by a R/W bit (set to 1 to indicate a read). The

slave device (MAX7469/MAX7470) generates an ACK

for the second address word and immediately after the

ACK clock pulse, the direction of data flow reverses.

The slave (MAX7469/MAX7470) then transmits 1 byte of

data containing the value of the register that was

SDA

SCL

10010A1A0

R/W

C7 C6 C5 C4 C3 C2 C1 C0

ACK ACK

OUTINOUTIN TO MAX7469/MAX7470

SDA (CONT)

SDA

DIRECTION

SDA

DIRECTION

SCL (CONT)

F7 F6 F5 F4 F3 F2 F1 ACK

OUT

IN IN

START

STOP

0001001 0

COMMAND BYTE C7–C0 IS 0010010.

SDA

DIRECTION

SCL

10010A1A0R/W

C7 C6 C5 C0

ACK ACK

OUTINOUTIN TO MAX7469/MAX7470

START STOP

00000000

C4 C3 C2 C1

THE COMMAND BYTE IS FOR POWER-DOWN.

Figure 6. Write Sequence to Update the Frequency Register

Figure 7. Write Sequence for a Command Byte

1 2 ... 8 9 10 11 12 13 14 15 16 17

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