参数资料
型号: ADUC834BSZ
厂商: Analog Devices Inc
文件页数: 51/80页
文件大小: 0K
描述: IC ADC DUAL16/24BIT W/MCU 52MQFP
产品培训模块: Process Control
标准包装: 1
系列: MicroConverter® ADuC8xx
核心处理器: 8052
芯体尺寸: 8-位
速度: 12.58MHz
连通性: EBI/EMI,I²C,SPI,UART/USART
外围设备: POR,PSM,PWM,温度传感器,WDT
输入/输出数: 34
程序存储器容量: 62KB(62K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 2.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.25 V
数据转换器: A/D 3x16b,4x24b; D/A 1x12b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 52-QFP
包装: 托盘
产品目录页面: 738 (CN2011-ZH PDF)
REV. A
ADuC834
–55–
TIMER/COUNTER 2 OPERATING 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 XXIX.
Table XXVIII. Timer 2 Operating Modes
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, 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 will also trigger the 16-bit reload and set
EXF2. The Autoreload Mode is illustrated in Figure 52.
16-Bit Capture Mode
In the Capture Mode, there are again two options, 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 over-
flow 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; EXF2, like TF2, can gener-
ate an interrupt. The Capture Mode is illustrated in Figure 53.
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 interrupts
will not occur so they do not have to be disabled. However, in
this mode, 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.
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
*THE CORE CLOCK IS THE OUTPUT OF THE PLL (SEE "ON-CHIP PLL")
Figure 52. 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
*THE CORE CLOCK IS THE OUTPUT OF THE PLL (SEE "ON-CHIP PLL")
Figure 53. Timer/Counter 2, 16-Bit Capture Mode
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