AT89LP2052-20SU Atmel, AT89LP2052-20SU Datasheet - Page 23
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AT89LP2052-20SU
Manufacturer Part Number
AT89LP2052-20SU
Description
IC 8051 MCU FLASH 2K 20SOIC
Manufacturer
Atmel
Series
89LPr
Datasheet
1.AT89LP2052-20PU.pdf
(94 pages)
Specifications of AT89LP2052-20SU
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
15
Program Memory Size
2KB (2K x 8)
Program Memory Type
FLASH
Ram Size
256 x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-SOIC (7.5mm Width)
Processor Series
AT89x
Core
8051
Data Bus Width
8 bit
Data Ram Size
256 B
Interface Type
UART, SPI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
15
Number Of Timers
2
Operating Supply Voltage
2.4 V to 5.5 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
Package
20SOIC W
Device Core
8051
Family Name
AT89
Maximum Speed
20 MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
15.6
15.7
3547J–MICRO–10/09
Port Read-Modify-Write
Port Alternate Functions
A read from a port will read either the state of the pins or the state of the port register depending
on which instruction is used. Simple read instructions will always access the port pins directly.
Read-modify-write instructions, which read a value, possibly modify it, and then write it back, will
always access the port register. This includes bit write instructions such as CLR or SETB as they
actually read the entire port, modify a single bit, then write the data back to the entire port. See
Table 15-2
Table 15-2.
Most general-purpose digital I/O pins of the AT89LP2052/LP4052 share functionality with the
various I/Os needed for the peripheral units.
pins. Alternate functions are connected to the pins in a logic AND fashion. In order to enable the
alternate function on a port pin, that pin must have a “1” in its corresponding port register bit, oth-
erwise, the input/output will always be “0”. Furthermore, each pin must be configured
for the correct input/output mode as required by its peripheral before it may be used as such.
Table 15-3
Table 15-3.
Mnemonic
ANL
ORL
XRL
JBC
CPL
INC
DEC
DJNZ
MOV PX.Y, C
CLR PX.Y
SETB PX.Y
PxM0.y
0
0
1
1
for a complete list of Read-Modify-Write instruction which may access the ports.
shows how to configure a generic pin for use with an alternate function.
Port Read-Modify-Write Instructions
Alternate Function Configurations for Pin y of Port x
PxM1.y
0
1
0
1
Instruction
Logical AND
Logical OR
Logical EX-OR
Jump if bit set and clear bit
Complement bit
Increment
Decrement
Decrement and jump if not zero
Move carry to bit Y of Port X
Clear bit Y of Port X
Set bit Y of Port X
Px.y
1
1
X
1
Table 15-4
I/O Mode
Bidirectional (internal pull-up)
Output
Input
Bidirectional (external pull-up)
AT89LP2052/LP4052
lists the alternate functions of the port
Example
ANL P1, A
ORL P1, A
XRL P1, A
JBC P3.0, LABEL
CPL P3.1
INC P1
DEC P3
DJNZ P3, LABEL
MOV P1.0, C
CLR P1.1
SETB P3.2
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