EZ80F92AZ020EG Zilog, EZ80F92AZ020EG Datasheet - Page 79

• Manufacturer Part Number: EZ80F92AZ020EG
• Description: IC ACCLAIM MCU 128KB 100LQFP
• Manufacturer: Zilog
• Series: eZ80® Acclaim!®r

Specifications of EZ80F92AZ020EG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 24
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 100-LQFP
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: I2C, IrDA, SPI, UART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 24
• Number Of Timers: 6
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 269-3871; EZ80F92AZ020EG

Watchdog Timer
PS015313-0508
Watchdog Timer Overview
The Watchdog Timer (WDT) helps protect against corrupt or unreliable software, power
faults, and other system-level problems which may place the CPU into unsuitable
operating states.
The eZ80F92 WDT features:
•
•
•
•
Figure 19
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
displays the block diagram for the Watchdog Timer.
WDT_CLK
Figure 19. Watchdog Timer Block Diagram
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]
Watchdog Timer
72