PT7C43390 Datasheet, PDF (30/38 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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d. Data access
 Real-time data 1 access
PT7C43390/43390C
Real-time Clock Module
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*1. Set NO_ACK = 1 when reading.
*2. Transmit ACK = 0 from the master device to the RTC when reading.
Real-Time Data 1 Access
 Real-time data 2 access
*1. Set NO_ACK = 1 when reading.
*2. Transmit ACK = 0 from the master device to the RTC when reading.
Real-Time Data 2 Access
 Status register 1 access and status register 2 access
*1. 0: Status register 1 selected, 1: Status register 2 selected
*2. Set NO_ACK = 1 when reading.
Status Register 1 Access and Status Register 2 Access
 INT1 register access and INT2 register access
In reading / writing the INT1 and INT2 registers, data varies depending on the setting of the status register 2. Be sure to read /
write after setting the status register 2. When setting the alarm by using the status register 2, these registers work as 3-byte alarm
time data registers, in other statuses, they work as 1-byte registers. When outputting the user-set frequency, they are the data
registers to set up the frequency. Regarding details of each data refer to "INT1 register and INT2 register" in "Configuration of
Registers".
2015-12-0001
PT0280-8 12/11/15
30