AT89LP428-20JU Atmel, AT89LP428-20JU Datasheet - Page 56
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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12.3.1
56
AT89LP428/828
Up Counter
Figure 12-2
this mode Timer 2 counts up to MAX and then sets the TF2 bit upon overflow. The overflow also
causes the timer registers to be reloaded with BOTTOM, the 16-bit value in RCAP2H and
RCAP2L. If EXEN2 = 1, a 16-bit reload can be triggered either by an overflow or by a 1-to-0 tran-
sition at external input T2EX. This transition also sets the EXF2 bit. Both the TF2 and EXF2 bits
can generate an interrupt. The Timer 2 overflow rate for this mode is given in the following
equation:
Timer 2 may also be configured to count from MIN to TOP instead of BOTTOM to MAX by set-
ting T2CM
RCAP2L and then overflows. The overflow sets TF2 and causes the timer registers to be
reloaded with MIN. If EXEN2 = 1, a 1-to-0 transition on T2EX will clear the timer and set EXF2.
The Timer 2 overflow rate for this mode is given in the following equation:
Timer 2 Count Mode 1 is provided to support variable precision asymmetrical PWM in the CCA.
The value of TOP stored in RCAP2H and RCAP2L is double-buffered such that a new TOP
value takes affect only after an overflow. The behavior of Count Mode 0 versus Count Mode 1 is
shown in
Figure 12-2. Timer 2 Diagram: Auto-reload Mode (DCEN = 0)
DCEN = 0, T2CM = 00B
DCEN = 0, T2CM = 01B
Auto-Reload Mode:
Auto-Reload Mode:
Figure
1-0
shows Timer 2 automatically counting up when DCEN = 0 and T2CM
= 01B. In this mode Timer 2 counts up to TOP, the 16-bit value in RCAP2H and
12-3.
÷TPS
Transition
Detector
Time-out Period
Time-out Period
Reload
=
=
65536
------------------------------------------------------------------------------ -
{
----------------------------------------------------------------- -
RCAP2H RCAP2L
Oscillator Frequency
Oscillator Frequency
TL2
–
{
RCAP2H RCAP2L
,
TH2
,
}
Overflow
+
1
×
(
}
TPS
3654A–MICRO–8/09
×
1-0
(
TPS
+
= 00B. In
1
Interrupt
Timer 2
)
+
1
)
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