AT89LP6440-20AU Atmel, AT89LP6440-20AU Datasheet - Page 76
AT89LP6440-20AU
Manufacturer Part Number
AT89LP6440-20AU
Description
MCU 8051 64K FLASH ISP 44TQFP
Manufacturer
Atmel
Series
89LPr
Specifications of AT89LP6440-20AU
Core Processor
8051
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
38
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Eeprom Size
8K x 8
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
Package
44TQFP
Device Core
8051
Family Name
89LP
Maximum Speed
20 MHz
Operating Supply Voltage
2.5|3.3 V
Data Bus Width
8 Bit
Number Of Programmable I/os
38
Interface Type
2-Wire/SPI
On-chip Dac
8-chx10-bit
Number Of Timers
3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LP6440-20AU
Manufacturer:
Cirrus
Quantity:
89
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13.3.2
13.4
76
Pulse Width Modulation Mode
AT89LP6440 - Preliminary
Timer 2 Operation for Compare Mode
Figure 13-6. Dual-Slope Waveform Example
Compare channels will work with any Timer 2 operating mode. The full 16-bit compare range
may not be available in all modes. In order for a compare output action to take place, the com-
pare values must be within the counting range of Timer 2. CTCx must be cleared to 0 for all
channels if Timer 2 is operating in Baud Rate mode or errors may occur in the serial
communication.
In Pulse Width Modulation (PWM) Mode, a compare channel can output a square wave with pro-
grammable frequency and duty cycle. Setting CCMx = 1 and CxM
Mode. PWM Mode is similar to Output Compare Mode except that the compare value is double-
buffered. A diagram of a CCA channel in PWM Mode is shown in
is selectable between inverting and non-inverting modes. PWM is intended for use with Timer 2
in Auto-Reload Mode (CP/RL2 = 0, DCEN = 0) using count modes 1, 2 or 3. The PWM can oper-
ate in asymmetric (edge-aligned) or symmetric (center-aligned) mode depending on the T2CM
selection. The CCA PWM has variable precision from 2 to 16 bits. A trade-off between frequency
and precision is made by changing the TOP value of the timer. The CCA PWM always uses the
greatest precision allowable for the selected output frequency, as compared to Timer 0 and 1
whose PWMs are fixed at 8-bit precision regardless of frequency.
Figure 13-7. CCA PWM Mode Diagram
{RCAP2H,RCA2L}
{CCAH,CCAL}
{CCBH,CCBL}
T2CCL
CCxL
shadow
TL2
CCA
CCB
shadow
T2CCH
CCxH
shadow
TH2
=
T2CCC
CCCx
CP/RL2 = 0, T2CM
CCFx
1-0
CIENx
CxM
= 10B, DCEN = 0
2-0
Figure
2-0
13-7. The PWM polarity
= 10xB enables PWM
Interrupt
CCx (P2.x)
3706A–MICRO–9/09
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