AT89LP428-20JU Atmel, AT89LP428-20JU Datasheet - Page 80
AT89LP428-20JU
Manufacturer Part Number
AT89LP428-20JU
Description
MCU 8051 4K FLASH SPI 32PLCC
Manufacturer
Atmel
Series
89LPr
Datasheet
1.AT89LP428-20AU.pdf
(149 pages)
Specifications of AT89LP428-20JU
Core Processor
8051
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
30
Program Memory Size
4KB (4K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
2.4 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-PLCC
Processor Series
AT89x
Core
8051
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
AT89ISP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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16.2.2
80
AT89LP428/828
Using Timer 2 to Generate Baud Rates
Programmers can achieve very low baud rates with Timer 1 by configuring the Timer to run as a
16-bit auto-reload timer (high nibble of TMOD = 0001B). In this case, the baud rate is given by
the following formula.
Table 16-2
Table 16-2.
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 16-3
Mode 0: 1 MHz
Mode 2: 750K
Baud Rate
62.5K
38.4K
19.2K
137.5
9.6K
4.8K
2.4K
1.2K
110
110
lists commonly used baud rates and how they can be obtained from Timer 1.
lists commonly used baud rates and how they can be obtained from Timer 2.
Commonly Used Baud Rates Generated by Timer 1 (TPS = 0000B)
Modes 1 and 3
Baud Rate
Modes 1, 3
Baud Rate
f
OSC
11.986
11.059
11.059
11.059
11.059
11.059
11.059
12
12
12
(MHz)
4
6
=
=
----- -
16
2
------------------- -
1
SMOD1
32
×
-------------------------------------------------------------------------------- -
[
65536
SMOD1
×
Oscillator Frequency
0
1
1
0
1
0
0
0
0
0
0
0
------------------------------------------------------- -
[
Oscillator Frequency
65536
–
(
RCAP2H,RCAP2L
–
(
RH1,RL1
C/T
X
X
0
0
0
0
0
0
0
0
0
0
)
]
×
)
-------------------- -
TPS
]
Mode
×
Timer 1
X
X
2
2
2
2
2
2
1
1
1
1
1
-------------------- -
TPS
+
1
1
+
1
3654A–MICRO–8/09
Reload Value
FEE0H
F55CH
F958H
F304H
DCH
DCH
F4H
F7H
B8H
70H
X
X
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