ACE5372

Low Power Real-Time Clock (RTC)

VER 1.2

17

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)

II) The second method to reading data from the internal register is to start immediately after writing to the

internal address pointer and the transmission format register. Set 4h to the transmission format register

when this method is used.

Example 2 of data read (when data is read from internal address Dh to 0h)

CPU to ACE5372

ACE5372 to CPU

Acknowledge signal

Start signal

Stop signal

Repeat Start signal

CPU to ACE5372

ACE5372 to CPU

Acknowledge signal

Start signal

Stop signal

Repeat Start signal

Inform ACE5372 to stop read

Inform ACE5372 to stop read