AT89LP428-20AU Atmel, AT89LP428-20AU Datasheet - Page 59

MCU 8051 4K FLASH SPI 32TQFP

AT89LP428-20AU

Manufacturer Part Number
AT89LP428-20AU
Description
MCU 8051 4K FLASH SPI 32TQFP
Manufacturer
Atmel
Series
89LPr
Datasheet

Specifications of AT89LP428-20AU

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-TQFP, 32-VQFP
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
Part Number:
AT89LP428-20AU
Manufacturer:
RFMD
Quantity:
1 240
Part Number:
AT89LP428-20AU
Manufacturer:
Atmel
Quantity:
10 000
12.4
3654A–MICRO–8/09
Baud Rate Generator
Figure 12-6. Timer 2 Waveform: Dual Slope Modes
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON
12-3 on page
used for the receiver or transmitter and Timer 1 is used for the other function. Setting RCLK
and/or TCLK puts Timer 2 into its baud rate generator mode, as shown in
The baud rate generator mode is similar to the auto-reload mode, in that a rollover in TH2
causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and
RCAP2L, which are preset by software.
The baud rates in UART modes 1 and 3 are determined by Timer 2’s overflow rate according to
the following equation.
The Timer can be configured for either timer or counter operation. In most applications, it is con-
figured for timer operation (CP/T2 = 0). The baud rate formulas are given below
.
where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit unsigned
integer.
T2CM = 01B
T2CM = 00B
EXF2
MAX
MAX
TOP
TOP
MIN
MIN
53). Note that the baud rates for transmit and receive can be different if Timer 2 is
Modes 1 and 3 Baud Rates
Modes 1, 3
Modes 1, 3
Baud Rate
Baud Rate
=
=
------------------------------------------------------------------------------------------------------------------ -
16
-------------------------------------------------------------------------------------------------------------------------------- -
16
×
×
(
(
TPS
TPS
T2CM
T2CM
=
+
+
Oscillator Frequency
Timer 2 Overflow Rate
----------------------------------------------------------- -
1-0
1-0
1
1
Oscillator Frequency
)
)
= 10B
= 11B
×
×
[
[
(
65536
RCAP2H RCAP2L
16
AT89LP428/828
(
RCAP2H,RCAP2L
,
Figure
)
+
TF2 Set
TF2 Set
12-7.
1
]
)
]
(Table
59

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