1-0
參數(shù)資料
型號: AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 102/149頁
文件大?。?/td> 0K
描述: MCU 8051 4K FLASH SPI 28PDIP
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 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/復位,POR,PWM,WDT
輸入/輸出數(shù): 30
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 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
56
3654A–MICRO–8/09
AT89LP428/828
12.3.1
Up Counter
Figure 12-2 shows Timer 2 automatically counting up when DCEN = 0 and T2CM
1-0 = 00B. In
this mode Timer 2 counts up to MAX and then sets the TF2 bit upon overflow. The overflow also
causes the timer registers to be reloaded with BOTTOM, the 16-bit value in RCAP2H and
RCAP2L. If EXEN2 = 1, a 16-bit reload can be triggered either by an overflow or by a 1-to-0 tran-
sition at external input T2EX. This transition also sets the EXF2 bit. Both the TF2 and EXF2 bits
can generate an interrupt. The Timer 2 overflow rate for this mode is given in the following
equation:
Timer 2 may also be configured to count from MIN to TOP instead of BOTTOM to MAX by set-
ting T2CM
1-0 = 01B. In this mode Timer 2 counts up to TOP, the 16-bit value in RCAP2H and
RCAP2L and then overflows. The overflow sets TF2 and causes the timer registers to be
reloaded with MIN. If EXEN2 = 1, a 1-to-0 transition on T2EX will clear the timer and set EXF2.
The Timer 2 overflow rate for this mode is given in the following equation:
Timer 2 Count Mode 1 is provided to support variable precision asymmetrical PWM in the CCA.
The value of TOP stored in RCAP2H and RCAP2L is double-buffered such that a new TOP
value takes affect only after an overflow. The behavior of Count Mode 0 versus Count Mode 1 is
shown in Figure 12-3.
Figure 12-2. Timer 2 Diagram: Auto-reload Mode (DCEN = 0)
Auto-Reload Mode:
DCEN = 0, T2CM = 00B
Time-out Period
65536
RCAP2H RCAP2L
{,
}
Oscillator Frequency
-------------------------------------------------------------------------------
TPS
1
+
()
×
=
Auto-Reload Mode:
DCEN = 0, T2CM = 01B
Time-out Period
RCAP2H RCAP2L
{,
}
1
+
Oscillator Frequency
------------------------------------------------------------------
TPS
1
+
()
×
=
÷TPS
TL2
TH2
Reload
Transition
Detector
Timer 2
Interrupt
Overflow
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