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| 型号： | ADUC836BSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 51/80页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL 16BIT W/MCU 52-MQFP |
| 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 7x16b; 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) |
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ADuC836
–54–
ADuC836
–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
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, which 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 tran-
sition 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
Capture Mode has two options, which 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; EXF2, like TF2, can generate an interrupt.
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 inter-
rupts 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 THE ON-CHIP PLL SECTION)
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 THE ON-CHIP PLL SECTION)
Figure 53.Timer/Counter 2, 16-Bit Capture Mode
REV. A
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