參數(shù)資料
型號: AT89LP52-20JU
廠商: Atmel
文件頁數(shù): 75/117頁
文件大小: 0K
描述: IC MCU 8051 8K FLASH SPI 44PLCC
標(biāo)準(zhǔn)包裝: 27
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: EBI/EMI,I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 36
程序存儲器容量: 8KB(8K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: *
60
3709D–MICRO–12/11
AT89LP51/52
The Timer 1 overflow rate normally determines the baud rates in Modes 1 and 3. When Timer 1
is the baud rate generator, the baud rates are determined by the Timer 1 overflow rate and the
value of SMOD1 according to the following equation:
The Timer 1 interrupt should be disabled in this application. The Timer itself can be configured
for either timer or counter operation in any of its 3 running modes. In the most typical applica-
tions, it is configured for timer operation in auto-reload mode (high nibble of TMOD = 0010B). In
this case, the baud rate is given by the following formula:
Table 14-2 lists commonly used baud rates and how they can be obtained from Timer 1.
14.2.2
Using Timer 2 to Generate Baud Rates
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
Modes 1, 3
Baud Rate
2
SMOD1
32
--------------------
(Timer 1 Overflow Rate)
×
=
Modes 1, 3
Baud Rate
2
SMOD1
32
--------------------
System Frequency
256
TH1
()
[]
--------------------------------------------------
1
TPS
1
+
---------------------
×
=
Table 14-2.
Commonly Used Baud Rates Generated by Timer 1
Baud Rate
fOSC (MHz)
CDV
SMOD1
Timer 1
C/T
Mode
TPS
Reload Value
Mode 0 Max: 6 MHz
12
0
1
X
0
X
Mode 2 Max: 750K
12
0
1
X
0
X
Modes 1, 3 Max: 750K
12
0
1
0
2
0
F4H
19.2K
11.059
0
1
0
2
0
DCH
9.6K
11.059
0
2
0
DCH
4.8K
11.059
0
00
20
B8H
2.4K
11.059
0
2
0
70H
1.2K
11.059
0
1
0
FEE0H
137.5
11.986
0
00
10
F55CH
110
6
0
1
0
1
0
F2AFH
110
12
0
00
10
F2AFH
19.2K
11.059
1
0
2
5
FDH
9.6K
11.059
1
0
2
5
FDH
4.8K
11.059
1
00
25
FAH
2.4K
11.059
1
0
2
5
F4H
1.2K
11.059
1
0
2
5
E8H
137.5
11.986
1
00
25
1DH
110
6
1
0
2
5
72H
110
12
1
0
1
5
FEEBH
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