AT89LP4052-20XU Atmel, AT89LP4052-20XU Datasheet - Page 25

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

Specifications of AT89LP4052-20XU

• 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-TSSOP
• 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: 20TSSOP
• 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

16.2
3547J–MICRO–10/09
Mode 1
a control bit in the Special Function Register TCON. GATE is in TMOD. The 13-bit register con-
sists of all 8 bits of TH1 and the lower 5 bits of TL1. The upper 3 bits of TL1 are indeterminate
and should be ignored. Setting the run flag (TR1) does not clear the registers. See
Figure 16-1. Timer/Counter 1 Mode 0: Variable Width Counter
Mode 0 operation is the same for Timer 0 as for Timer 1, except that TR0, TF0 and INT0 replace
the corresponding Timer 1 signals in
Timer 1 (TMOD.7) and one for Timer 0 (TMOD.3).
In Mode 1 the Timers are configured for 16-bit auto-reload. The Timer register is run with all 16
bits. The 16-bit reload value is stored in the high and low reload registers (RH1/RL1). The clock
is applied to the combined high and low timer registers (TH1/TL1). As clock pulses are received,
the timer counts up: 0000H, 0001H, 0002H, etc. An overflow occurs on the FFFFH-to-0000H
transition, upon which the timer register is reloaded with the value from RH1/RL1 and the over-
flow flag bit in TCON is set. See
the full 16-bit timer period compatible with the standard 8051. Mode 1 operation is the same for
Timer/Counter 0.
Figure 16-2. Timer/Counter 1 Mode 1: 16-bit Auto-Reload
INT1 Pin
INT1 Pin
T1 Pin
GATE
OSC
GATE
T1 Pin
OSC
TR1
TR1
C/T = 0
C/T = 1
C/T = 0
C/T =1
Figure
Control
Control
Figure
16-2. The reload registers default to 0000H, which gives
16-1. There are two different GATE bits, one for
(8 Bits)
TL1
(8 Bits)
(8 Bits)
RL1
TL1
AT89LP2052/LP4052
(8 Bits)
(8 Bits)
(8 Bits)
RH1
TH1
TH1
PSC1
Reload
TF1
TF1
Figure
Interrupt
Interrupt
16-1.
25