
ZC702 Board User Guide
www.xilinx.com
37
UG850 (v1.2) April 4, 2013
Feature Descriptions
Information about the PCA9548 is available on the TI Semiconductor website at
[Ref 12]
.
Real Time Clock
[
Figure 1-2
, callout
15
]
The Epson RTC-8564JE is an 1
2
C bus interface real-time clock that has a built-in 32.768 KHz
oscillator with these features
•
Frequency output options: 32.768 KHz, 1024 Hz, 32 Hz or 1 Hz
•
Calendar output functions: Year, month, day, weekday, hour, minute and second
•
Clock counter, alarm and fixed-cycle timer interrupt functions
Programming information for the RTC-8564JE is available in the
RTC-8564JE/NB Application
Manual
at the Epson Electronics America website
[Ref 9]
.
Figure 1-17
shows the real time clock circuit.
Table 1-19:
I
2
C Bus Addresses
I
2
C Bus
I
2
C Switch Position
I
2
C Address
PCA9548 8-Channel bus switch
NA
0b1110100
USRCLK_SDA/SCL
0
0b1011101
IIC_SDA_HDMI
1
0b0111001
IIC_EEPROM_SDA/SCL
2
0b1010100
IIC_PORT_EXPANDER_SDA/SCL
3
0b0100001
IIC_RTC_SDA/SCL
4
0b1010001
FMC1_LPC_IIC_SDA/SCL
5
0bxxxxx00
FMC2_LPC_IIC_SDA/SCL
6
0bxxxxx00
PMBUS_DATA/CLOCK
7
0b1010
[ADDR]
(1)
Notes:
1. This I
2
C address is the binary equivalent of the TI Power Controller PMBus address
52, 53, or 54 which corresponds to 010, 011 and 100 in the lower 3 bits.