AT89LP6440-20JU Atmel, AT89LP6440-20JU Datasheet - Page 63

• Manufacturer Part Number: AT89LP6440-20JU
• Description: MCU 8051 64K FLASH ISP 44PLCC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20JU

• 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-PLCC
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: 2-Wire, SPI
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89ISP
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 12-2. Timer 2 Diagram: Auto-Reload Mode (DCEN = 0)
Figure 12-3. Timer 2 Waveform: Auto-Reload Mode (DCEN = 0)
12.3.2
3706A–MICRO–9/09
Up or Down Counter
BOTTOM
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
Setting DCEN = 1 enables Timer 2 to count up or down, as shown in
the T2EX pin controls the direction of the count (if EXEN2 = 1). A logic 1 at T2EX makes Timer 2
count up. When T2CM
also causes BOTTOM, the 16-bit value in RCAP2H and RCAP2L, to be reloaded into the timer
MAX
MAX
TOP
MIN
MIN
DCEN = 0, T2CM = 01B
÷TPS
Auto-Reload Mode:
Figure
12-3.
1-0
= 00B, the timer will overflow at MAX and set the TF2 bit. This overflow
T2CM
T2CM
Time-out Period
1-0
1-0
= 00B, DCEN = 0
= 01B, DCEN = 0
TL2
AT89LP6440 - Preliminary
=
TH2
{
----------------------------------------------------------------- -
RCAP2H RCAP2L
Oscillator Frequency
,
TF2 Set
TF2 Set
Figure
}
+
1
12-4. In this mode,
×
(
TPS
+
1
)
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