EZ80F93AZ020EC00TR Zilog, EZ80F93AZ020EC00TR Datasheet - Page 80
EZ80F93AZ020EC00TR
Manufacturer Part Number
EZ80F93AZ020EC00TR
Description
IC ACCLAIM MCU 64KB 100LQFP
Manufacturer
Zilog
Series
eZ80® Acclaim!®r
Specifications of EZ80F93AZ020EC00TR
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
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 105°C
Package / Case
100-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
EZ80F93AZ020EC00T
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PS015313-0508
Watchdog Timer Operation
Enabling and Disabling the WDT
The Watchdog Timer is disabled upon a RESET. To enable the WDT, the application
program must set the WDT_EN bit (bit 7) of the WDT_CTL register. When enabled, the
WDT cannot be disabled without a RESET.
Time-Out Period Selection
There are four choices of time-out periods for the WDT—2
clock cycles. The WDT time-out period is defined by the WDT_PERIOD field of the
WDT_CTL register (WDT_CTL[1:0]). The approximate time-out period for two
different WDT clock sources is listed in
Table 26. Watchdog Timer Approximate Time-Out Delays
RESET Or NMI Generation
On a WDT time-out, the RST_FLAG bit in the WDT_CTL register is set to 1. In addition,
the WDT can cause a RESET or send a nonmaskable interrupt (NMI) signal to the CPU.
The default operation is for the WDT to cause a RESET. It asserts/deasserts on the rising
edge of the clock. The RST_FLAG bit can be polled by the CPU to determine the source
of the RESET event.
Clock Source
32.768 kHz Crystal Oscillator
32.768 kHz Crystal Oscillator
32.768 kHz Crystal Oscillator
32.768 kHz Crystal Oscillator
20 MHz System Clock
20 MHz System Clock
20 MHz System Clock
20 MHz System Clock
50 MHz System Clock
50 MHz System Clock
50 MHz System Clock
50 MHz System Clock
Note: *WDT time-out values should be sufficiently long to allow Flash
operations to complete.
Divider Value
2
2
2
2
2
2
2
2
2
2
2
2
18
22
25
27
18
22
25
27
18
22
25
27
Table
26.
Time Out Delay
209.7 ms*
13.1 ms*
83.9 ms
4096 s
5.2 ms
1024 s
1.68 s
6.71 s
0.67 s
2.68 s
8.00 s
128 s
18
, 2
22
Product Specification
, 2
25
eZ80F92/eZ80F93
, and 2
Watchdog Timer
27
system
73
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