AT89LP214-20XU Atmel, AT89LP214-20XU Datasheet - Page 36

• Manufacturer Part Number: AT89LP214-20XU
• Description: MCU 8051 2K FLASH 20MHZ 14-TSSOP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP214-20XU

• 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: 12
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-TSSOP
• Package: 14TSSOP
• Device Core: 8051
• Family Name: AT89
• Maximum Speed: 20 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 12
• Interface Type: SPI/UART
• Number Of Timers: 2
• Core: 8051
• Processor Series: AT89x
• Maximum Clock Frequency: 20 MHz
• Data Ram Size: 128 B
• Mounting Style: SMD/SMT
• Height: 1.05 mm
• Length: 5.1 mm
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.4 V
• Width: 4.5 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

14.5.4
36
AT89LP213/214
Mode 3 – Split 8-bit PWM
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 AT89LP213 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.
Figure 14-10. Timer/Counter 0 PWM Mode 3
INT0 Pin
GATE
Mode 3:
Mode 3, T1:
Mode 3, T0:
TR0
OSC
OSC
TR1
f
out
÷TPS
÷TPS
Duty Cycle %
Duty Cycle %
=
Oscillator Frequency
------------------------------------------------------ -
Control
256
=
=
100
100
(8 Bits)
(8 Bits)
(8 Bits)
(8 Bits)
OCR0
OCR1
RL0
RH0
TL0
TH0
×
×
RH0
----------- -
RL0
---------- -
256
256
×
=
=
-------------------- -
TPS
1
+
Figure
1
14-10. Only the Timer
3538E–MICRO–11/10
T0
T1