EZ80F91NA050SC Zilog, EZ80F91NA050SC Datasheet - Page 124

• Manufacturer Part Number: EZ80F91NA050SC
• Description: IC ACCLAIM MCU 256KB 144-BGA
• Manufacturer: Zilog
• Series: eZ80® Acclaim!®r

Specifications of EZ80F91NA050SC

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: Ethernet, I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 144-LBGA
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 50 MHz
• Data Ram Size: 16 KB
• Number Of Programmable I/os: 32
• Number Of Timers: 16 Bit
• Operating Supply Voltage: 3 V to 3.6 V
• Mounting Style: SMD/SMT
• Height: 1.5 mm
• Length: 13 mm
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Width: 13 mm
• For Use With: 269-4712 - KIT DEV ENCORE 32 SERIES269-4671 - BOARD ZDOTS SBC Z80ACCLAIM PLUS269-4561 - KIT DEV FOR EZ80F91 W/C-COMPILER269-4560 - KIT DEV FOR EZ80F91 W/C-COMPILER
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: No RoHS Version Available
• Other names: 269-3251

Watchdog Timer
PS019215-0910
System Clock
RTC Clock
The Watchdog Timer (WDT) helps protect against corrupt or unreliable software, power
faults, and other system-level problems which places the CPU into unsuitable operating
states. The eZ80F91 WDT features:
•
•
•
•
Figure 25
Oscillator
Four programmable time-out ranges (depending on the WDT clock source). The four
ranges are:
–
–
–
–
Three selectable WDT clock sources:
–
–
–
A selectable time-out response: a time-out is configured to generate either a RESET or
a nonmaskable interrupt (NMI)
A WDT time-out RESET indicator flag
WDT
03.2–5.20 ms
51.2–83.9 ms
0.50–0.82 sec
2.68–4.00 sec
Internal RC oscillator
System clock
Real-Time Clock source (on-chip 32 kHz crystal oscillator or 50/60 Hz signal)
displays a block diagram of the Watchdog Timer.
WDT_CLK
Figure 25. Watchdog Timer Block Diagram
Time-out Compare Logic
(WDT_PERIOD)
Upcounter
28-Bit
RESET
NMI to eZ80 CPU
WDT Control Logic
Control Register/
Reset Register
Product Specification
Data[7:0]
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eZ80F91 MCU
Watchdog Timer
115