參數(shù)資料
型號(hào)： AP160L
廠商： AMIC Technology Corporation
英文描述： Zener Diode; Zener Voltage Typ, Vz:5.1V; Vz Test Current, Izt:20mA; Power Dissipation, Pd:500mW; Package/Case:41-MiniDIP; Leaded Process Compatible:Yes; Mounting Type:Surface Mount; Peak Reflow Compatible (260 C):Yes
中文描述： 8位單片機(jī)8KB的檢察官辦公室
文件頁(yè)數(shù)： 9/25頁(yè)
文件大?。?/td> 677K
代理商： AP160L
AP160
Version 0.0
9
AMIC Technology, Inc.
In this mode, two options are selected by bit EXEN2 in T2CON. If EXEN2=0, Timer2 counts up to 0FFFFH and then sets
the TF2 bit upon overflow. The overflow also causes the timer registers to be reloaded with the 16-bit value in RCAP2H and
RCAP2L. The values in Timer in Capture Mode RCAP2H and RCAP2L are preset by software.
If EXEN2=1, a 16-bit reload can be triggered either by an overflow or by a 1-to-0 transition at external input T2EX. This
transition also sets the EXF2 bit. Both the TF2 and EXF2 bits can generate an interrupt if enabled. Setting the DCEN bit
enables Timer2 to count up or down, as shown in Figure 3. In the mode, the T2EX pin controls the direction of the count. A
logic 1 at T2EX makes Timer 2 count up. The timer will overflow at 0FFFFH and set the TF2 bit. The overflow also causes
the 16-bit value in RCAP2H and RCAP2L to be reloaded into the timer registers, TH2 and TL2, respectively. A logic 0 at
T2EX makes Timer 2 count down. The timer underflows when TH2 and Tl2 equal the values stored in RCAP2H and
RACP2L. The underflow sets the TF2 bit and causes 0FFFFH to be reloaded into the timer registers. The EXF2 bit toggles
whenever Timer 2 overflows or underflows and can be used as a 17
bit of resolution. In this operating mode, EXF2 does
not flag an interrupt.
Table 3.
T2MOD (Timer 2 Mode Control Register)
T2Mod Address = 0C9H Reset Value = XXXX XX00B
Not bit addressable
Bit
7
6
5
4
Symbol
-
-
-
-
Symbol
-
Not implemented, reserved for future
T2OE
Timer 2 Output Enable bit.
DCEN
When set, this bit allows Timer 2 to be configured as an up/down counter.
(DOWN COUNTING RELOAD VALUE)
3
-
2
-
1
0
T2OE
DCEN
Function
OSC
C/T2=0
T2 PIN
CONTROL
TR2
C/T2=1
T2EX PIN
12
÷
OVERFLOW
0FFH
0FFH
RCAP2H
RCAP2L
TH2
TL2
TF2
COUNT
DIRECTION
1=UP
0=DOWN
TIMER 2
INTERRUPT
EXF2
TOGGLE
(UP COUNTING RELOAD VALUE)
Figure 3.
Timer 2 Auto Reload Mode (DCEN=1)
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