AT89LP6440-20MU Atmel, AT89LP6440-20MU Datasheet - Page 81
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
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AT89LP6440-20MU
Manufacturer:
Atmel
Quantity:
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Figure 13-14. Multi-Phasic PWM Modes
14. External Interrupts
3706A–MICRO–9/09
PHSD
PHSD
CCA
CCB
CCC
CCD
CCA
CCB
CCC
CCD
CCA
CCB
CCC
CCD
CCA
CCB
CCC
CCD
CCA
CCB
CCC
CCD
The INT0 (P3.2) and INT1 (P3.3) pins of the AT89LP6440 may be used as external interrupt
sources. The external interrupts can be programmed to be level-activated or transition-activated
by setting or clearing bit IT1 or IT0 in Register TCON. If ITx = 0, external interrupt x is triggered
by a detected low at the INTx pin. If ITx = 1, external interrupt x is edge-triggered. In this mode if
successive samples of the INTx pin show a high in one cycle and a low in the next cycle, inter-
rupt request flag IEx in TCON is set. Flag bit IEx then requests the interrupt. Since the external
interrupt pins are sampled once each clock cycle, an input high or low should hold for at least 2
oscillator periods to ensure sampling. If the external interrupt is transition-activated, the external
source has to hold the request pin high for at least two clock cycles, and then hold it low for at
least two clock cycles to ensure that the transition is seen so that interrupt request flag IEx will
be set. IEx will be automatically cleared by the CPU when the service routine is called if gener-
ated in edge-triggered mode. If the external interrupt is level-activated, the external source has
to hold the request active until the requested interrupt is actually generated. Then the external
source must deactivate the request before the interrupt service routine is completed, or else
PHS = 000B
PHS = 001B
PHS = 010B
PHS = 011B
PHS = 100B
AT89LP6440 - Preliminary
81
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