參數(shù)資料
型號: AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 112/149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?。?/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
65
3654A–MICRO–8/09
AT89LP428/828
13.2
Input Capture Mode
The Compare/Capture Array provides a variety of capture modes suitable for time-stamping
events or performing measurements of pulse width, frequency, slope, etc. The CCA channels
are configured for capture mode by clearing the CCMx bit in the associated CCCx register to 0.
Each time a capture event occurs, the contents of Timer 2 (TH2 and TL2) are transferred to the
16-bit data register of the corresponding channel, and the channel’s interrupt flag CCFx is set in
T2CCF. Optionally, the capture event may also clear Timer 2 to 0000H by setting the CTCx bit in
CCCx. The capture event is defined by the CxM
2-0 bits in CCCx and may be either externally or
internally generated. A diagram of a CCA channel in capture mode is shown in Figure 13-2.
Figure 13-2. CCA Capture Mode Diagram
Table 13-5.
T2CCF – Timer/Counter 2 Compare/Capture Flags
T2CCF Address = 0D5H
Reset Value = XXXX 0000B
Not Bit Addressable
CCFD
CCFC
CCFB
CCFA
Bit
7
654
321
0
Symbol
Function
CCFD
Channel D Compare/Capture Interrupt Flag. Set by a compare/capture event on channel D. Must be cleared by software.
CCFD will generate an interrupt when CIEND = 1 and ECC = 1.
CCFC
Channel C Compare/Capture Interrupt Flag. Set by a compare/capture event on channel C. Must be cleared by
software. CCFC will generate an interrupt when CIENC = 1 and ECC = 1.
CCFB
Channel B Compare/Capture Interrupt Flag. Set by a compare/capture event on channel B. Must be cleared by software.
CCFB will generate an interrupt when CIENB = 1 and ECC = 1.
CCFA
Channel A Compare/Capture Interrupt Flag. Set by a compare/capture event on channel A. Must be cleared by software.
CCFA will generate an interrupt when CIENA = 1 and ECC = 1.
TL2
TH2
CCxL
CCxH
CCCx
Interrupt
(P2.x) CCx
T2CCC
T2CCL
T2CCH
0
1
2
3
4
5
6
7
“0”
Timer 0 Overflow
Timer 1 Overflow
Comparator A
Comparator B
00H
CTCx
CCFx
CIENx
CxM2-0
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