ez80f92 ZiLOG Semiconductor, ez80f92 Datasheet - Page 95

• Manufacturer Part Number: ez80f92
• Description: Ez80acclaim Flash Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Real-Time Clock
PS015313-0508
System Clock
Real-Time Clock Overview
The Real-Time Clock (RTC) keeps time by maintaining a count of seconds, minutes,
hours, day-of-the-week, day-of-the-month, year, and century. The current time is kept in
24-hour format. The format for all count and alarm registers is selectable between binary
and binary-coded-decimal (BCD). The calendar operation maintains the correct day of the
month and automatically compensates for leap year. A simplified block diagram of the
RTC and the associated on-chip, low-power, 32 kHz oscillator is displayed in
Connections to an external battery supply and 32 kHz crystal network are also displayed
in
Figure 24. Real-Time Clock and 32 kHz Oscillator Block Diagram
Figure
IRQ
ADDR[15:0]
DATA[7:0]
Real-Time Clock
24.
V
RTC Clock
DD
(RTC_CTRL[4])
CLK_SEL
Enab l e
V
DD
Low-Power
32 KHz Oscillator
RTC_X
RTC_X
RTC_V
DD
OUT
IN
Crystal
32 KH z
R1
Product Specification
Battery
Real-Time Clock
Figure
C
C
24.
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