AT89LP428 Atmel Corporation, AT89LP428 Datasheet - Page 49
AT89LP428
Manufacturer Part Number
AT89LP428
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT89LP428.pdf
(149 pages)
Specifications of AT89LP428
Flash (kbytes)
4 Kbytes
Max. Operating Frequency
25 MHz
Cpu
8051-1C
Max I/o Pins
30
Spi
1
Uart
1
Sram (kbytes)
0.75
Eeprom (bytes)
512
Self Program Memory
IAP
Operating Voltage (vcc)
2.4 to 5.5
Timers
3
Isp
SPI/OCD
Watchdog
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LP428-20AU
Manufacturer:
RFMD
Quantity:
1 240
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11.5.3
3654A–MICRO–8/09
Mode 2 – 8-bit Frequency Generator
Figure 11-7. Timer/Counter 1 PWM Mode 1
Timer 0 in PWM mode 2 functions as an 8-bit Auto-reload timer, the same as normal Mode 2,
with the exception that the output pin T0 is toggled at every TL0 overflow (see
Figure 11-9 on page
used to output a square wave of varying frequency. THx acts as an 8-bit counter. The following
formula gives the output frequency for Timer 0 in PWM mode 2.
Figure 11-8. Timer/Counter 1 PWM Mode 2
Note:
INT1 Pin
GATE
{RH0 & RL0}/{RH1 & RL1} are not required by Timer 0/Timer 1 during PWM mode 2 and may be
used as temporary storage registers.
INT1 Pin
GATE
OSC
TR1
Mode 2:
TR1
50). Timer 1 in PWM mode 2 is identical to Timer 0. PWM mode 2 can be
OSC
÷TPS
Control
f
÷TPS
OUT
Control
=
Oscillator Frequency
------------------------------------------------------ -
2
×
(8 Bits)
(8 Bits)
(
RL1
256 TH0
TL1
–
(8 Bits)
(8 Bits)
TH1
TL1
)
×
(8 Bits)
(8 Bits)
OCR1
RH1
TH1
-------------------- -
TPS
AT89LP428/828
1
=
+
1
Figure 11-8
T1
T1
and
49
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