AT89LP428-20MH Atmel, AT89LP428-20MH Datasheet - Page 37
AT89LP428-20MH
Manufacturer Part Number
AT89LP428-20MH
Description
MCU 8051 4K FLASH SPI 32VQFN
Manufacturer
Atmel
Series
89LPr
Datasheet
1.AT89LP428-20AU.pdf
(149 pages)
Specifications of AT89LP428-20MH
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-TQFP
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
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10.1.2
10.1.3
3654A–MICRO–8/09
Input-only Mode
Open-drain Output
The input only port configuration is shown in
input includes a Schmitt-triggered input for improved input noise rejection. The input circuitry of
P3.2, P3.3, P3.6, P4.0 and P4.1 is not disabled during Power-down (see
fore these pins should not be left floating during Power-down when configured in this mode.
Figure 10-2. Input Only
Figure 10-3. Input Circuit for P3.2, P3.3 and P3.6
The open-drain output configuration turns off all pull-ups and only drives the pull-down transistor
of the port pin when the port latch contains a logic “0”. To be used as a logic output, a port con-
figured in this manner must have an external pull-up, typically a resistor tied to V
down for this mode is the same as for the quasi-bidirectional mode. The open-drain port configu-
ration is shown in
Power-down (see
down when configured in this mode.
Figure 10-4. Open-drain Output
From Port
Register
Figure
Figure
Input
Data
Input
Data
10-3) and therefore these pins should not be left floating during Power-
10-4. The input circuitry of P3.2, P3.3 and P3.6 is not disabled during
PWD
Input
Data
Figure
PWD
10-2. The output drivers are tristated. The
AT89LP428/828
Port
Pin
Port
Pin
Figure
Port
Pin
10-3) and there-
CC
. The pull-
37
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