AT89LP52-20JU Atmel, AT89LP52-20JU Datasheet - Page 75

• Manufacturer Part Number: AT89LP52-20JU
• Description: IC MCU 8051 8K FLASH SPI 44PLCC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP52-20JU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 8KB (8K 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: 44-LCC (J-Lead)
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: Serial
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

16. Instruction Set Summary
3709B–MICRO–12/10
The AT89LP51/52 is fully binary compatible with the 8051 instruction set. In Compatibility mode
the AT89LP51/52 has identical execution time with AT89S51/52 and other standard 8051s. The
difference between the AT89LP51/52 in Fast mode and the standard 8051 is the number of
cycles required to execute an instruction. Fast mode instructions may take 1 to 5 clock cycles to
complete. The execution times of most instructions may be computed using
that for the purposes of this table, a clock cycle is one period of the output of the system clock
divider. For Fast mode the divider defaults to 1, so the clock cycle equals the oscillator period.
For Compatibility mode the divider defaults to 2, so the clock cycle is twice the oscillator period,
or conversely the clock count is half the number of oscillator periods.
Table 16-1.
Generic Instruction Types
Most arithmetic, logical, bit and transfer instructions
Branches and Calls
Single Byte Indirect (i.e. ADD A, @Ri, etc.)
RET, RETI
MOVC
MOVX
MUL
DIV
INC DPTR
Arithmetic
ADD A, Rn
ADD A, direct
ADD A, @Ri
ADD A, #data
ADDC A, Rn
ADDC A, direct
ADDC A, @Ri
ADDC A, #data
SUBB A, Rn
SUBB A, direct
SUBB A, @Ri
SUBB A, #data
INC Rn
INC direct
INC @Ri
INC A
DEC Rn
DEC direct
Instruction Execution Times and Exceptions
Bytes
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
AT89LP51/52 - Preliminary
Compatibility
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
(1)
Clock Cycles
Fast Mode Cycle Count Formula
Fast
1
2
2
2
1
2
2
2
1
2
2
2
1
2
2
2
1
2
# bytes + 1
# bytes
4
Table
2
4
3
2
4
2
(3)
Hex Code
16-1. Note
28-2F
38-3F
98-9F
08-0F
18-1F
26-27
36-37
96-97
06-07
25
24
35
34
95
94
05
04
15
75