AT89LP6440 Atmel Corporation, AT89LP6440 Datasheet - Page 53

• Manufacturer Part Number: AT89LP6440
• Manufacturer: Atmel Corporation

Specifications of AT89LP6440

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 38
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 153.8
• Sram (kbytes): 4.25
• Eeprom (bytes): 8192
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 3.6
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

11.3
11.4
3706C–MICRO–2/11
Mode 2 – 8-bit Auto-Reload Timer/Counter
Mode 3 – 8-bit Split Timer
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)
AT89LP3240/6440
RH1
TH1
)
Reload
×
Reload
(
TPS
TF1
TF1
+
1
)
Interrupt
Interrupt
53