參數(shù)資料
型號(hào): AT89LP428-20PU
廠商: Atmel
文件頁數(shù): 101/149頁
文件大?。?/td> 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
55
3654A–MICRO–8/09
AT89LP428/828
12.2
Capture Mode
In the Capture mode, Timer 2 is a fixed 16-bit timer or counter that counts up from MIN to MAX.
An overflow from MAX to MIN sets bit TF2 in T2CON. If EXEN2 = 1, a 1-to-0 transition at exter-
nal input T2EX also causes the current value in TH2 and TL2 to be captured into RCAP2H and
RCAP2L, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON to be set.
The EXF2 and TF2 bits can generate an interrupt. Capture mode is illustrated in Figure 12-1.
The Timer 2 overflow rate in Capture mode is given by the following equation:
Figure 12-1. Timer 2 Diagram: Capture Mode
12.3
Auto-Reload Mode
Timer 2 can be programmed to count up or down when configured in its 16-bit auto-reload
mode. This feature is invoked by the DCEN (Down Counter Enable) bit located in the SFR
T2MOD (see Table 12-4). Upon reset, the DCEN bit is set to 0 so that timer 2 will default to
count up. When DCEN is set, Timer 2 can count up or down, depending on the value of the
T2EX pin. The overflow and reload values depend on the Timer 2 Count Mode bits, T2CM
1-0 in
T2MOD. A summary of the Auto-reload behaviors is listed in Table 12-5.
Capture Mode:
Time-out Period
65536
Oscillator Frequency
-------------------------------------------------------
TPS
1
+
()
×
=
÷TPS
EXF2
T2EX PIN
T2 PIN
TR2
EXEN2
C/T2 = 0
C/T2 = 1
CAPTURE
OVERFLOW
TRANSITION
DETECTOR
TIMER 2
INTERRUPT
RCAP2H
RCAP2L
TL2
TH2
TF2
OSC
Table 12-5.
Summary of Auto-reload Modes
T2CM
1-0
DCEN
T2EX
Direction
Behavior
00
0
X
Up
reload to BOTTOM
00
1
0
Down
underflow to MAX
00
1
Up
overflow to BOTTOM
01
0
X
Up
reload to MIN
01
1
0
Down
underflow to TOP
01
1
Up
overflow to MIN
10
X
Up-down
and repeat
11
X
Up-down
and repeat
BOTTOM
MAX
MAX
BOTTOM
BOTTOM
MAX
MIN
TOP
TOP
MIN
MIN
TOP
MIN
TOP
MIN
→→
MIN
TOP
MIN
→→
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