AT89LP6440-20JU Atmel, AT89LP6440-20JU Datasheet - Page 52

• Manufacturer Part Number: AT89LP6440-20JU
• Description: MCU 8051 64K FLASH ISP 44PLCC
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20JU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 38
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 8K x 8
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.4 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: 2-Wire, SPI
• Maximum Clock Frequency: 24 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 3.6 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
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 8 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.3
11.4
52
Mode 2 – 8-bit Auto-Reload Timer/Counter
Mode 3 – 8-bit Split Timer
AT89LP6440 - Preliminary
Figure 11-2. Timer/Counter 1 Mode 1: 16-bit Auto-Reload
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 11-3. Timer/Counter 1 Mode 2: 8-bit Auto-Reload
Note:
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
is locked into a timer function (counting clock cycles) and takes over the use of TR1 and TF1
from Timer 1. Thus, TH0 now controls the Timer 1 interrupt. While Timer 0 is in Mode 3, Timer 1
will still obey its settings in TMOD but cannot generate an interrupt.
Figure
INT1 Pin
RH1/RL1 are not required by Timer 1 during Mode 2 and may be used as temporary storage
registers.
GATE1
OSC
INT0 Pin
Figure
T1 Pin
11-3. Overflow from TL1 not only sets TF1, but also reloads TL1 with the contents of
OSC
T1 Pin
GATE1
Mode 2:
11-4. TL0 uses the Timer 0 control bits: C/T, GATE0, TR0, INT0, and TF0. TH0
TR1
÷TPS
÷TPS
TR1
Time-out Period
C/T = 0
C/T =1
C/T = 0
C/T = 1
Control
=
Control
------------------------------------------------------ -
Oscillator Frequency
(8 Bits)
(8 Bits)
(
256 TH0
RL1
TL1
(8 Bits)
(8 Bits)
TH1
TL1
–
(8 Bits)
(8 Bits)
RH1
TH1
)
Reload
×
Reload
(
TPS
TF1
TF1
+
1
)
3706A–MICRO–9/09
Interrupt
Interrupt