參數(shù)資料
型號: AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 105/149頁
文件大小: 0K
描述: MCU 8051 4K FLASH SPI 28PDIP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 14
系列: 89LP
核心處理器: 8051
芯體尺寸: 8-位
速度: 20MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲(chǔ)器容量: 4KB(4K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量: 768 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: 28-DIP(0.300",7.62mm)
包裝: 管件
59
3654A–MICRO–8/09
AT89LP428/828
Figure 12-6. Timer 2 Waveform: Dual Slope Modes
12.4
Baud Rate Generator
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON (Table
12-3 on page 53). Note that the baud rates for transmit and receive can be different if Timer 2 is
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 Figure 12-7.
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.
MAX
MIN
TOP
T2CM1-0 = 10B
MAX
MIN
TOP
TF2 Set
T2CM1-0 = 11B
EXF2
Modes 1 and 3 Baud Rates
Timer 2 Overflow Rate
16
------------------------------------------------------------
=
T2CM = 00B
Modes 1, 3
Baud Rate
Oscillator Frequency
16
TPS
1
+
()
×
65536
RCAP2H,RCAP2L
()
[]
×
---------------------------------------------------------------------------------------------------------------------------------
=
T2CM = 01B
Modes 1, 3
Baud Rate
Oscillator Frequency
16
TPS
1
+
()
×
RCAP2H RCAP2L
(,
)
1
+
[]
×
-------------------------------------------------------------------------------------------------------------------
=
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