AT89LP428-20JU Atmel, AT89LP428-20JU Datasheet - Page 49
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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11.5.3
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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