參數資料
型號: ADUC848BSZ62-5
廠商: Analog Devices Inc
文件頁數: 86/108頁
文件大?。?/td> 0K
描述: IC FLASH MCU W/16BIT ADC 52MQFP
標準包裝: 1
系列: MicroConverter® ADuC8xx
核心處理器: 8052
芯體尺寸: 8-位
速度: 12.58MHz
連通性: I²C,SPI,UART/USART
外圍設備: POR,PSM,PWM,溫度傳感器,WDT
輸入/輸出數: 34
程序存儲器容量: 62KB(62K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 4K x 8
RAM 容量: 2.25K x 8
電壓 - 電源 (Vcc/Vdd): 4.75 V ~ 5.25 V
數據轉換器: A/D 10x16b; D/A 1x12b,2x16b
振蕩器型: 內部
工作溫度: -40°C ~ 125°C
封裝/外殼: 52-QFP
包裝: 托盤
Data Sheet
ADuC845/ADuC847/ADuC848
Rev. C | Page 79 of 108
Timer/Counter 2 Operating Modes
The following sections describe the operating modes for
Timer/Counter 2. The operating modes are selected by bits in
the T2CON SFR as shown in Table 53.
Table 53. T2CON Operating Modes
RCLK (or) TCLK
CAP2
TR2
Mode
0
1
16-Bit Autoreload
0
1
16-Bit Capture
1
X
1
Baud Rate
X
0
Off
16-Bit Autoreload Mode
Autoreload mode has two options that are selected by bit
EXEN2 in T2CON. If EXEN2 = 0, when Timer 2 rolls over, it
not only sets TF2 but also causes the Timer 2 registers to be
reloaded with the 16-bit value in registers RCAP2L and
RCAP2H, which are preset by software. If EXEN2 = 1, Timer 2
still performs the above, but with the added feature that a 1-to-0
transition at external input T2EX also triggers the 16-bit reload
and sets EXF2. Autoreload mode is shown in Figure 56.
16-Bit Capture Mode
Capture mode has two options that are selected by Bit EXEN2
in T2CON. If EXEN2 = 0, Timer 2 is a 16-bit timer or counter
that, upon overflowing, sets bit TF2, the Timer 2 overflow bit,
which can be used to generate an interrupt. If EXEN2 = 1,
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. Capture mode is shown in Figure 57. The
baud rate generator mode is selected by RCLK = 1 and/or
TCLK = 1.
In either case, if Timer 2 is used to generate the baud rate, the
TF2 interrupt flag does not occur. Therefore, Timer 2 interrupts
do not occur, so they do not have to be disabled. In this mode,
the EXF2 flag can, however, still cause interrupts, which can be
used as a third external interrupt. Baud rate generation is
described as part of the UART serial port operation in the
following section.
CORE
CLK1
T2
PIN
TR2
CONTROL
TL2
(8 BITS)
TH2
(8 BITS)
RELOAD
TF2
EXF2
TIMER
INTERRUPT
EXEN2
CONTROL
TRANSITION
DETECTOR
T2EX
PIN
RCAP2L
RCAP2H
*
04741-053
C/ T2 = 0
C/ T2 = 1
NOTES
1.
THE CORE CLOCK IS THE OUTPUT OF THE PLL (SEE THE ON-CHIP PLL SECTION)
Figure 56. Timer/Counter 2, 16-Bit Autoreload Mode
TF2
CORE
CLK1
T2
PIN
TR2
CONTROL
TL2
(8 BITS)
TH2
(8 BITS)
CAPTURE
EXF2
TIMER
INTERRUPT
EXEN2
CONTROL
TRANSITION
DETECTOR
T2EX
PIN
RCAP2L
RCAP2H
*
04741-054
C/ T2 = 0
C/ T2 = 1
NOTES
1.
THE CORE CLOCK IS THE OUTPUT OF THE PLL (SEE THE ON-CHIP PLL SECTION)
Figure 57. Timer/Counter 2, 16-Bit Capture Mode
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