BU9929FV

Multimedia ICs

7/11

1. Data write mode

St SLAVE ADDRESS W

A COMMAND BYTE A

WRITE DATA 1

PION7

− PION0

PIO15

− PIO8

AA

Sp

WRITE DATA 2

Command register : At reset, D0 to D7 are ”0”.

D7

SHT DWN

D6

INT SEL

D5

DOUT SEL

D4

OUT ON

D3

DIR ON

D2

BYTE SEL

D1

EDGE SEL

D0

DET ON

D7 : Shut Down mode

0 : Shut down mode off (Normal operation mode)

1 : Shut down mode on

D6 : INT output method choice

0 : LOW output

1 : Output of LOW pulse equivalent for one period of CLK

D5 : Detection result output choice

0 : Serial output. INT pin is also valid.

1 : Serial output (I

D4 : Output port writing set

0 : Writing invalid

1 : Writing valid. But, a port, which is indicated as input, is invalid.

Following Write data 2byte-0 : “L” output, 1 : “H” output

D3 : I / O direction set

0 : Direction set invalid

1 : Direction set valid

Following Write data 2byte-0 : input, 1 : output

D2 : Watching object input choice

0 : PION0 to PION7

1 : PION8 to PIO15

D1 : Change detection mode

0 : Falling edge

1 : Both rising and falling edge

D0 : Input port condition watching mode

0 : Invalid

1 : Valid