EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 86

• 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

Watch-Dog Timer
PS015308-0404
Watch-Dog Timer Overview
The Watch-Dog Timer (WDT) helps protect against corrupt or unreliable software, power
faults, and other system-level problems which may place the CPU into unsuitable operat-
ing states. The eZ80F92 WDT features:
•
•
•
•
Figure 19 illustrates the block diagram for the Watch-Dog Timer.
System Clock
Four programmable time-out periods: 2
Two selectable WDT clock sources: the system clock or the Real-Time Clock source
(on-chip 32 KHz crystal oscillator or 50/60 Hz signal)
A selectable time-out response: a time-out can be configured to generate either a
RESET or a nonmaskable interrupt (NMI)
A WDT time-out RESET indicator flag
RTC Clock
WDT_CLK
Figure 19.Watch-Dog Timer Block Diagram
P R E L I M I N A R Y
Time-out Compare Logic
(WDT_PERIOD)
Upcounter
28-Bit
18
, 2
22
, 2
25
, and 2
27
clock cycles
Product Specification
RESET
NMI to eZ80 CPU
WDT Control Logic
Control Register/
Reset Register
eZ80F92/eZ80F93
Data[7:0]
Watch-Dog Timer
74