AT89LP428-20PU Atmel, AT89LP428-20PU Datasheet - Page 110

• Manufacturer Part Number: AT89LP428-20PU
• Description: MCU 8051 4K FLASH SPI 28PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP428-20PU

• 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: 28-DIP (0.300", 7.62mm)
• 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

110
AT89LP428/828
Table 20-1.
Notes:
Branching
JC rel
JNC rel
JB bit, rel
JNB bit, rel
JBC bit, rel
JZ rel
JNZ rel
SJMP rel
ACALL addr11
LCALL addr16
RET
RETI
AJMP addr11
LJMP addr16
JMP @A+DPTR
JMP @A+PC
CJNE A, direct, rel
CJNE A, #data, rel
CJNE Rn, #data, rel
CJNE @Ri, #data, rel
CJNE A, @R0, rel
CJNE A, @R1, rel
DJNZ Rn, rel
DJNZ direct, rel
NOP
BREAK
(1)(3)
1. This escaped instruction is an extension to the instruction set.
2. MOVX @DPTR instructions take 2 clock cycles when accessing ERAM and 4 clock cycles
3. The BREAK instruction acts as a 2 cycle NOP.
when accessing FDATA or CODE. (3 and 5 cycles for MOVX @/DPTR).
(1)
Instruction Execution Times and Exceptions (Continued)
(1)
(1)
Bytes
2
2
3
3
3
2
2
2
2
3
1
1
2
3
1
2
3
3
3
3
3
3
2
3
1
2
8051
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
24
12
–
–
–
–
Clock Cycles
AT89LP
3
3
4
4
4
3
3
3
3
4
4
4
3
4
2
3
4
4
4
4
4
3
4
1
2
4
3654A–MICRO–8/09
11,31,51,71,91,
01,21,41,61,81,
Hex Code
A1,C1,E1
B1,D1,F1
D8 - DF
B8 - BF
B6 - B7
A5 B6
A5 B7
A5 73
A5 00
B5
B4
D5
40
50
20
30
10
60
70
80
12
22
32
02
73
00