AT89LP51ED2-20MU Atmel, AT89LP51ED2-20MU Datasheet - Page 80

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

Specifications of AT89LP51ED2-20MU

• Rohs: yes
• Core: 8051
• 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: VQFN-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
• Processor Series: AT89x
• Program Memory Type: Flash
• Factory Pack Quantity: 360

13.1
.
Table 13-2.
80
Symbol
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
TCON = 88H
Bit Addressable
Bit
Registers
AT89LP51RD2/ED2/ID2 Preliminary
Function
Timer 1 Overflow Flag
Set by hardware on Timer/Counter overflow. Cleared by hardware when the processor vectors to interrupt routine.
Timer 1 Run Control
Set/cleared by software to turn Timer/Counter on/off.
Timer 0 Overflow Flag
Set by hardware on Timer/Counter overflow. Cleared by hardware when the processor vectors to interrupt routine.
Timer 0 Run Control
Set/cleared by software to turn Timer/Counter on/off.
Interrupt 1 Edge Flag
Set by hardware when external interrupt edge detected. Cleared when interrupt processed.
Interrupt 1 Type
Set/cleared by software to specify falling edge/low level triggered external interrupts.
Interrupt 0 Edge Flag
Set by hardware when external interrupt edge detected. Cleared when interrupt processed.
Interrupt 0 Type
Set/cleared by software to specify falling edge/low level triggered external interrupts.
TCON
TF1
7
– Timer/Counter Control Register
Table 13-1
Table 13-1.
Note:
Name
TCON
TMOD
TL0
TL1
TH0
TH1
TCONB
RL0
RL1
RH0
RH1
TR1
6
The RHn/RLn registers are not required by the Timer during Modes 0, 2 or 3 and may be used as
temporary storage registers in these modes, except when using the PWM generator.
lists the registers used by Timer 0/1. TCON, TCONB and TMOD are detailed below.
Address
Timer 0/1 Register Summary
8AH
8BH
8CH
8DH
88H
89H
91H
F2H
F3H
F4H
F5H
TF0
5
Purpose
Control
Mode
Timer 0 low-byte
Timer 1 low-byte
Timer 0 high-byte
Timer 1 high-byte
Mode
Timer 0 reload high-byte
Timer 1 reload high-byte
Timer 0 reload low-byte
Timer 1 reload low-byte
TR0
4
IE1
3
IT1
2
Reset Value = 0000 0000B
IE0
1
Bit-Addressable
3714A–MICRO–7/11
IT0
N
N
N
N
N
N
N
N
N
N
0
Y