AT89LP51ED2-20AAU Atmel, AT89LP51ED2-20AAU Datasheet - Page 81

• Manufacturer Part Number: AT89LP51ED2-20AAU
• Description: 8-bit Microcontrollers - MCU 64KB 20MHz 2.4V-5.5V
• Manufacturer: Atmel

Specifications of AT89LP51ED2-20AAU

• Rohs: yes
• Core: 8051
• Processor Series: AT89x
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-44
• Mounting Style: SMD/SMT
• Data Rom Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Program Memory Type: Flash
• Factory Pack Quantity: 160

Table 13-3.
3714A–MICRO–7/11
TMOD Address = 089H
Not Bit Addressable
Symbol
GATE1
C/T1
T1M1
T1M0
GATE0
C/T0
T0M1
T0M0
Bit
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 output mode.
Timer 1 Operating Mode
Mode
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 output mode.
Timer 0 Operating Mode
Mode
7
TMOD – Timer/Counter Mode Control Register
0
1
2
3
0
1
2
3
T1M1
T0M1
C/T1
0
0
1
1
0
0
1
1
6
T1M0
T0M0
0
1
0
1
0
1
0
1
T1M1
5
Operation
Variable Timer Mode. 8-bit Timer/Counter TH1 with TL1 as 1–8 bit prescaler. Default
is 5 bits for a 13-bit timer/counter compatible with AT89C51RD2/ED2/ID2.
16-bit Auto-Reload Mode. TH1 and TL1 are cascaded to form a 16-bit Timer/Counter
which is reloaded from RH1 and RL1 when 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 Timer Mode. 8-bit Timer/Counter TH0 with TL0 as 1–8 bit prescaler. Default
is 5 bits for a 13-bit timer/counter compatible with AT89C51RD2/ED2/ID2.
16-bit Auto-Reload Mode. TH0 and TL0 are cascaded to form a 16-bit Timer/Counter
which is reloaded from RH0 and RL0 when 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 only an 8-bit timer controlled by Timer 1 control bits.
T1M0
4
AT89LP51RD2/ED2/ID2 Preliminary
GATE0
3
C/T0
2
Reset Value = 0000 0000B
T0M0
1
T0M1
0
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