ACE5372

Low Power Real-Time Clock (RTC)

VER 1.3

18

Data Transmission Read Format in the ACE5372

The ACE5372 allows the following three readout methods of data from an internal register.

I) The first method to reading data from the named internal address

A)The first three steps are the same as write model

B)After one bit ACK signal, a new start signal will be produced to change the direction of data

transmission in INTERFACE connection.

C)Then send 7 address bit(0110010), the eighth bit command is “1”, ACE5372 is under data reading

condition.

D) After another bit’s ACK signal, it starts reading data normally.

E)When a byte data is read and CPU sends 1 bit ACK signal, a next byte data can be read. Only when

the 1 bit ACK signal which is sent by CPU is high voltage, can the reading operation be stopped and

then CPU sends stop signals.

Example 1 of data read (when data is read from 7H to 9H)

CPU to ACE5372

ACE5372 to CPU

Acknowledge signal

Start signal

Stop signal

Repeat Start signal

Inform ACE5372 to stop read