AT89LP6440-20PU Atmel, AT89LP6440-20PU Datasheet - Page 54

• Manufacturer Part Number: AT89LP6440-20PU
• Description: MCU 8051 64K FLASH ISP 40PDIP
• Manufacturer: Atmel
• Series: 89LPr

Specifications of AT89LP6440-20PU

• 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: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 11-3.
54
TMOD Address = 089H
Not Bit Addressable
Symbol
GATE1
C/T1
T1M1
T1M0
GATE0
C/T0
T0M1
T0M0
Bit
AT89LP6440 - Preliminary
GATE1
Function
Timer 1 Gating Control. When set, Timer/Counter 1 is enabled only while INT1 pin is high and TR1 control pin is set.
When cleared, Timer 1 is enabled whenever TR1 control bit is set.
Timer or Counter Selector 1. Cleared for Timer operation (input from internal system clock). Set for Counter operation
(input from T1 input pin). C/T1 must be zero when using Timer 1 in PWM mode.
Timer 1 Operating Mode
Mode
0
1
2
3
Timer 0 Gating Control. When set, Timer/Counter 0 is enabled only while INT0 pin is high and TR0 control pin is set.
When cleared, Timer 0 is enabled whenever TR0 control bit is set.
Timer or Counter Selector 0. Cleared for Timer operation (input from internal system clock). Set for Counter operation
(input from T0 input pin). C/T0 must be zero when using Timer 0 in PWM mode.
Timer 0 Operating Mode
Mode
0
1
2
3
7
TMOD – Timer/Counter Mode Control Register
T1M1
0
0
1
1
T0M1
0
0
1
1
C/T1
6
T1M0
0
1
0
1
T0M0
0
1
0
1
T1M1
5
Operation
Variable 9–16-bit Timer Mode. 8-bit Timer/Counter TH1 with TL1 as 1–8-bit prescaler.
16-bit Auto-Reload Mode. TH1 and TL1 are cascaded to form a 16-bit Timer/Counter
that is reloaded with RH1 and RL1 each time it overflows.
8-bit Auto Reload Mode. TH1 holds a value which is reloaded into 8-bit Timer/Counter
TL1 each time it overflows.
Timer/Counter 1 is stopped
Operation
Variable 9–16-bit Timer Mode. 8-bit Timer/Counter TH0 with TL0 as 1–8-bit prescaler.
16-bit Auto-Reload Mode. TH0 and TL0 are cascaded to form a 16-bit Timer/Counter
that is reloaded with RH0 and RL0 each time it overflows.
8-bit Auto Reload Mode. TH0 holds a value which is reloaded into 8-bit Timer/Counter
TL0 each time it overflows.
Split Timer Mode. TL0 is an 8-bit Timer/Counter controlled by the standard Timer 0
control bits. TH0 is an 8-bit timer only controlled by Timer 1 control bits.
T1M0
4
GATE0
3
C/T0
2
Reset Value = 0000 0000B
T0M0
1
T0M1
0
3706A–MICRO–9/09