BU9929FV Datasheet, PDF (8/12 Pages) Rohm – I2C BUS interface, general purpose I/O ports with condition watching function

Multimedia ICs
BU9929FV
2. Data read mode
According to the following format, input/output value of PIO/PION pins can be read by I²C interface.
PIO data read
St SLAVE ADDRESS R A READ DATA 1 A READ DATA 2 A Sp
PION7 − PION0
PIO15 − PIO8
PIO part block diagram
(PIO part block diagram)
Output Buffer
Output Register
Command D4
I²C BUS
IC
PAD
I / O select
Shut Down
Selector
Input Schmitt
Input Register
Command D3
Read Mode
Input Port sampling timing
As shown below, BU9929FV is sampling for Input Ports with the rising edges of CLK.
Therefore it is necessary that Input Ports are keeping at least 1 CLK cycle, for their certain inputs.
Watching Ports
F6
C7
AA
CLK
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