AT94K05AL-25BQU Atmel, AT94K05AL-25BQU Datasheet - Page 110

• Manufacturer Part Number: AT94K05AL-25BQU
• Description: IC FPSLIC 5K GATE 25MHZ 144-LQFP
• Manufacturer: Atmel
• Series: FPSLIC®r

Specifications of AT94K05AL-25BQU

• Core Type: 8-bit AVR
• Speed: 25MHz
• Interface: I²C, UART
• Program Sram Bytes: 4K-16K
• Fpga Sram: 2kb
• Data Sram Bytes: 4K ~ 16K
• Fpga Core Cells: 256
• Fpga Gates: 5K
• Fpga Registers: 436
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• For Use With: ATSTK594 - BOARD FPSLIC DAUGHTER FOR STK500
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

4.27
110
Watchdog Timer
AT94KAL Series FPSLIC
Table 4-22.
Notes:
In up/down PWM mode, the Timer Overflow Flag1, TOV1, is set when the counter advances
from $0000. In overflow PWM mode, the Timer Overflow flag is set as in normal Timer/Counter
mode. Timer Overflow Interrupt1 operates exactly as in normal Timer/Counter mode, i.e., it is
executed when TOV1 is set provided that Timer Overflow Interrupt1 and global interrupts are
enabled. This also applies to the Timer Output Compare1 flags and interrupts.
The Watchdog Timer is clocked from a separate on-chip oscillator which runs at 1 MHz. This is
the typical value at V
By controlling the Watchdog Timer prescaler, the watchdog reset interval can be adjusted, see
Table 4-23 on page 111
the Watchdog Timer. Eight different clock cycle periods can be selected to determine the reset
period. If the reset period expires without another watchdog reset, the FPSLIC resets and exe-
cutes from the reset vector.
To prevent unintentional disabling of the watchdog, a special turn-off sequence must be followed
when the watchdog is disabled, see
Figure 4-35. Watchdog Timer
COM1X1
1. In overflow PWM mode, this table is only valid for OCR1X = TOP.
2. X = A or B
1
1
1
1
(2)
PWM Outputs OCR1X = $0000 or TOP
CC
= 3.3V. See characterization data for typical values at other V
for a detailed description. The WDR (watchdog reset) instruction resets
COM1X0
0
0
1
1
(2)
Figure
4-35.
OCR1X
$0000
$0000
TOP
TOP
(1)
(2)
Output OC1X
H
H
L
L
1138I–FPSLI–1/08
(2)
CC
levels.