AT89LP4052-20SU Atmel, AT89LP4052-20SU Datasheet - Page 26

• Manufacturer Part Number: AT89LP4052-20SU
• Description: IC 8051 MCU FLASH 4K 20SOIC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP4052-20SU

• 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: 4KB (4K 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: SPI/UART
• 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: Lead free / RoHS Compliant

16.3
16.4
26
Mode 2
Mode 3
AT89LP2052/LP4052
Mode 2 configures the Timer register as an 8-bit Counter (TL1) with automatic reload, as shown
in
TH1, which is preset by software. The reload leaves TH1 unchanged. Mode 2 operation is the
same for Timer/Counter 0.
Figure 16-3. Timer/Counter 1 Mode 2: 8-bit Auto-Reload
Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0. Timer 0 in
Mode 3 establishes TL0 and TH0 as two separate counters. The logic for Mode 3 on Timer 0 is
shown in
locked into a timer function (counting machine cycles) and takes over the use of TR1 and TF1
from Timer 1. Thus, TH0 now controls the Timer 1 interrupt.
Mode 3 is for applications requiring an extra 8-bit timer or counter. With Timer 0 in Mode 3, the
AT89LP2052/LP4052 can appear to have three Timer/Counters. When Timer 0 is in Mode 3,
Timer 1 can be turned on and off by switching it out of and into its own Mode 3. In this case,
Timer 1 can still be used by the serial port as a baud rate generator or in any application not
requiring an interrupt.
Figure 16-4. Timer/Counter 0 Mode 3: Two 8-bit Counters
Figure
INT0 Pin
Figure
16-3. Overflow from TL1 not only sets TF1, but also reloads TL1 with the contents of
GATE
T0 Pin
OSC
INT0 Pin
T1 Pin
GATE
16-4. TL0 uses the Timer 0 control bits: C/T, GATE, TR0, INT0, and TF0. TH0 is
TR1
C/T = 0
C/T =1
C/T = 0
C/T = 1
Control
Control
Control
(8 Bits)
(8 Bits)
(8 Bits)
(8 Bits)
TH1
TL1
Reload
TF1
Interrupt
3547J–MICRO–10/09
Interrupt
Interrupt