AT89LP52-20MU Atmel, AT89LP52-20MU Datasheet - Page 38

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

Specifications of AT89LP52-20MU

• 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-VFQFN Exposed Pad
• 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

Figure 9-1.
Figure 9-2.
Figure 9-3.
Figure 9-4.
38
Clock Cycles
Clock Cycles
Clock Cycles
Clock Cycles
Instruction
Instruction
Instruction
Instruction
AT89LP51/52 - Preliminary
INT0
INT0
INT0
INT0
Minimum Interrupt Response Time (Fast Mode)
Maximum Interrupt Response Time (Fast Mode)
Minimum Interrupt Response Time (Compatibility Mode)
Maximum Interrupt Response Time (Compatibility Mode)
IE0
IE0
IE0
IE0
Cur. Instr.
1
instruction is 5 cycles long. If the instruction in progress is RETI, the additional wait time cannot
be more than 9 cycles (a maximum of 4 more cycles to complete the instruction in progress, plus
a maximum of 5 cycles to complete the next instruction). Thus, in a single-interrupt system, the
response time is always more than 5 clock cycles and less than 14 clock cycles. See
and
1
Ack.
1
1
Ack.
Figure
RETI
LCALL
RETI
LCALL
9-2.
13
MOVX @/DPTR, A
5
14
ISR
5
1st ISR Instr.
Ack.
MUL AB
10
LCALL
Ack.
37
14
1st ISR Instr.
LCALL
49
ISR
3709B–MICRO–12/10
Figure 9-1