EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 102

• Manufacturer Part Number: EZ80F920120MOD
• Description: MODULE EZ80F92 512K 20MHZ
• Manufacturer: Zilog

Specifications of EZ80F920120MOD

• Module/board Type: Development Module
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 MB
• Interface Type: Cable
• Maximum Clock Frequency: 20 MHz
• Operating Supply Voltage: 0 V to 3.3 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: 0 C
• For Use With/related Products: eZ80F92
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3157; EZ80F920120MOD

Real-Time Clock
Figure 23.Real-Time Clock and 32KHz Oscillator Block Diagram
PS015308-0404
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 illustrated in Figure 23.
Connections to an external battery supply and 32 KHz crystal network are also demon-
strated in Figure 23.
IRQ
ADDR[15:0]
DATA[7:0]
Real-Time Clock
V
RTC Clock
DD
(RTC_CTRL[4])
CLK_SEL
P R E L I M I N A R Y
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
eZ80F92/eZ80F93
Battery
Real-Time Clock
C
C
90