AT89LP6440-20MU Atmel, AT89LP6440-20MU Datasheet - Page 52
![MCU 8051 64K FLASH ISP 44VQFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
AT89LP6440-20MU
Manufacturer Part Number
AT89LP6440-20MU
Description
MCU 8051 64K FLASH ISP 44VQFN
Manufacturer
Atmel
Series
89LPr
Datasheet
1.AT89LP6440-20MU.pdf
(194 pages)
Specifications of AT89LP6440-20MU
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-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LP6440-20MU
Manufacturer:
Atmel
Quantity:
987
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11.3
11.4
52
Mode 2 – 8-bit Auto-Reload Timer/Counter
Mode 3 – 8-bit Split Timer
AT89LP6440 - Preliminary
Figure 11-2. Timer/Counter 1 Mode 1: 16-bit Auto-Reload
Mode 2 configures the Timer register as an 8-bit Counter (TL1) with automatic reload, as shown
in
TH1, which is preset by software. The reload leaves TH1 unchanged. Mode 2 operation is the
same for Timer/Counter 0.
Figure 11-3. Timer/Counter 1 Mode 2: 8-bit Auto-Reload
Note:
Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0. Timer 0 in
Mode 3 establishes TL0 and TH0 as two separate counters. The logic for Mode 3 on Timer 0 is
shown in
is locked into a timer function (counting clock cycles) and takes over the use of TR1 and TF1
from Timer 1. Thus, TH0 now controls the Timer 1 interrupt. While Timer 0 is in Mode 3, Timer 1
will still obey its settings in TMOD but cannot generate an interrupt.
Figure
INT1 Pin
RH1/RL1 are not required by Timer 1 during Mode 2 and may be used as temporary storage
registers.
GATE1
OSC
INT0 Pin
Figure
T1 Pin
11-3. Overflow from TL1 not only sets TF1, but also reloads TL1 with the contents of
OSC
T1 Pin
GATE1
Mode 2:
11-4. TL0 uses the Timer 0 control bits: C/T, GATE0, TR0, INT0, and TF0. TH0
TR1
÷TPS
÷TPS
TR1
Time-out Period
C/T = 0
C/T =1
C/T = 0
C/T = 1
Control
=
Control
------------------------------------------------------ -
Oscillator Frequency
(8 Bits)
(8 Bits)
(
256 TH0
RL1
TL1
(8 Bits)
(8 Bits)
TH1
TL1
–
(8 Bits)
(8 Bits)
RH1
TH1
)
Reload
×
Reload
(
TPS
TF1
TF1
+
1
)
3706A–MICRO–9/09
Interrupt
Interrupt
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