AT89LP428-20JU Atmel, AT89LP428-20JU Datasheet - Page 50
AT89LP428-20JU
Manufacturer Part Number
AT89LP428-20JU
Description
MCU 8051 4K FLASH SPI 32PLCC
Manufacturer
Atmel
Series
89LPr
Datasheet
1.AT89LP428-20AU.pdf
(149 pages)
Specifications of AT89LP428-20JU
Core Processor
8051
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
30
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-PLCC
Processor Series
AT89x
Core
8051
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
AT89ISP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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11.5.4
50
AT89LP428/828
Mode 3 – Split 8-bit PWM
Figure 11-9. PWM Mode 2 Waveform
Timer 1 in PWM mode 3 simply holds its count. The effect is the same as setting TR1 = 0.
Timer 0 in PWM mode 3 establishes TL0 and TH0 as two separate PWM counters in a manner
similar to normal mode 3. PWM mode 3 on Timer 0 is shown in
Prescaler is available to change the output frequency during PWM mode 3. TL0 can use the
Timer 0 control bits: GATE, TR0, INT0, PWM0EN and TF0. TH0 is locked into a timer function
and uses TR1, PWM1EN and TF1. RL0 provides the duty cycle for TL0 and RH0 provides the
duty cycle for TH0.
PWM mode 3 is for applications requiring a single PWM channel and two timers, or two PWM
channels and an extra timer or counter. With Timer 0 in PWM mode 3, the AT89LP428/828 can
appear to have three Timer/Counters. When Timer 0 is in PWM mode 3, Timer 1 can be turned
on and off by switching it out of and into its own mode 3. In this case, Timer 1 can still be used by
the serial port as a baud rate generator or in any application not requiring an interrupt. The fol-
lowing formulas give the output frequency and duty cycle for Timer 0 in PWM mode 3.
Mode 3:
Mode 3, T1:
THx
Mode 3, T0:
FFh
Tx
f
OUT
Duty Cycle %
Duty Cycle %
=
Oscillator Frequency
------------------------------------------------------ -
256
=
=
100
100
×
×
RH0
----------- -
RL0
---------- -
256
256
×
-------------------- -
TPS
1
+
Figure
1
11-10. Only the Timer
3654A–MICRO–8/09
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