AT89LP51ED2-20MU Atmel, AT89LP51ED2-20MU Datasheet - Page 113

• 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

Table 17-3.
17.2.2
3714A–MICRO–7/11
Modes 1, 3 Max: 750K
Mode 0 Max: 6 MHz
Mode 2 Max: 750K
Baud Rate
19.2K
137.5
19.2K
137.5
9.6K
4.8K
2.4K
1.2K
9.6K
4.8K
2.4K
1.2K
110
110
110
110
Using Timer 2 to Generate Baud Rates
Commonly Used Baud Rates Generated by Timer 1
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON. Under
these conditions, the baud rates for transmit and receive can be simultaneously different by
using Timer 1 for transmit and Timer 2 for receive, or vice versa. The baud rate generator mode
is similar to the auto-reload mode, in that a rollover causes the Timer 2 registers to be reloaded
with the 16-bit value in registers RCAP2H and RCAP2L, which are preset by software. In this
case, the baud rates in Modes 1 and 3 are determined by Timer 2’s overflow rate according to
the following equation:
Table 17-4
that TPS and T2X2 do not apply to Timer 2 in baud rate mode.
f
OSC
11.059
11.059
11.059
11.059
11.059
11.986
11.059
11.059
11.059
11.059
11.059
11.986
12
12
12
12
12
(MHz)
6
6
lists commonly used baud rates and how they can be obtained from Timer 2. Note
X2
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
Modes 1 and 3
Baud Rate
SMOD1
AT89LP51RD2/ED2/ID2 Preliminary
0
0
1
1
1
1
0
0
0
0
1
0
1
0
0
0
0
0
0
=
----- -
16
1
×
C/T
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-------------------------------------------------------------------------------- -
[
65536
System Frequency
–
(
RCAP2H,RCAP2L
Mode
X
X
2
2
2
2
2
1
1
1
1
2
2
2
2
2
2
2
1
Timer 1
TPS
0
0
0
0
0
0
0
0
0
5
5
5
5
5
5
5
5
0
0
)
]
Reload Value
FEEBH
FEE0H
F55CH
F2AFH
F2AFH
DCH
DCH
FDH
FDH
B8H
FAH
E8H
1DH
F4H
70H
F4H
72H
X
X
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