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| 型號(hào)： | ADUC812BCPZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 11.0592 MHz, MICROCONTROLLER, PQCC56 |
| 封裝： | LEAD FRAME, CSP-56 |
| 文件頁數(shù)： | 28/60頁 |
| 文件大小： | 1276K |
| 代理商： | ADUC812BCPZ-REEL |
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REV. E
ADuC812
–34–
Timer/Counter Operation Modes
The following paragraphs describe the operating modes for
Timer/Counter 2. The operating modes are selected by bits in the
T2CON SFR as shown in Table XVIII.
Table XVIII. TIMECON SFR Bit Designations
RCLK (or) TCLK
CAP2
TR2
MODE
00
1
16-Bit Autoreload
01
1
16-Bit Capture
1X
1Baud Rate
XX
0
OFF
16-Bit Autoreload Mode
In Autoreload mode, there are two options, which are selected by
bit EXEN2 in T2CON. If EXEN2 = 0, then when Timer 2 rolls
over, it not only sets TF2 but also causes the Timer 2 registers to
reload with the 16-bit value in registers RCAP2L and RCAP2H,
which are preset by software. If EXEN2 = 1 then Timer 2 still
performs the above, but with the added feature that a 1-to-0
transition at external input T2EX will also trigger the 16-bit reload
and set EXF2. The Autoreload mode is illustrated in Figure 30.
16-Bit Capture Mode
In the Capture mode, there are again two options, which are
selected by bit EXEN2 in T2CON. If EXEN2 = 0, then Timer 2
is a 16-bit timer or counter that, upon overflowing, sets bit TF2,
the Timer 2 overflow bit, that can be used to generate an inter-
rupt. If EXEN2 = 1, then Timer 2 still performs the above, but
a l-to-0 transition on external input T2EX causes the current
value in the Timer 2 registers, TL2 and TH2, to be captured into
registers RCAP2L and RCAP2H, respectively. In addition, the
transition at T2EX causes bit EXF2 in T2CON to be set, and
EXF2, like TF2, can generate an interrupt. The Capture mode
is illustrated in Figure 31.
The baud rate generator mode is selected by RCLK = 1 and/or
TCLK = 1.
In either case, if Timer 2 is being used to generate the baud rate,
the TF2 interrupt flag will not occur. Therefore Timer 2 inter-
rupts will not occur, so they do not have to be disabled. In this
mode however, the EXF2 flag can still cause interrupts and this
can be used as a third external interrupt.
Baud rate generation will be described as part of the UART
serial port operation in the following pages.
CORE
CLK
12
T2
PIN
C/T2 = 0
C/T2 = 1
TR2
CONTROL
TL2
(8 BITS)
TH2
(8 BITS)
RELOAD
TF2
EXF2
TIMER
INTERRUPT
EXEN2
CONTROL
TRANSITION
DETECTOR
T2EX
PIN
RCAP2L
RCAP2H
Figure 30. Timer/Counter 2, 16-Bit Autoreload Mode
TF2
CORE
CLK
12
T2
PIN
TR2
CONTROL
TL2
(8 BITS)
TH2
(8 BITS)
CAPTURE
EXF2
TIMER
INTERRUPT
EXEN2
CONTROL
TRANSITION
DETECTOR
T2EX
PIN
RCAP2L
RCAP2H
C/T2 = 0
C/T2 = 1
Figure 31. Timer/Counter 2, 16-Bit Capture Mode
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