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| 型號： | ADUC812BSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 26/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU FLASH 12BIT ADC 52MQFP |
| 標(biāo)準(zhǔn)包裝： | 800 |
| 系列： | MicroConverter® ADuC8xx |
| 核心處理器： | 8052 |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | PSM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 34 |
| 程序存儲器容量： | 8KB（8K x 8） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 640 x 8 |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x12b，D/A 2x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 52-QFP |
| 包裝： | 帶卷 (TR) |
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REV.
ADuC812
–32–
Mode 2 (8-Bit Timer/Counter with Auto Reload)
Mode 2 configures the timer register as an 8-bit counter (TL0)
with automatic reload, as shown in Figure 28. Overflow from TL0
not only sets TF0, but also reloads TL0 with the contents of TH0,
which is preset by software. The reload leaves TH0 unchanged.
12
CORE
CLK
TF0
CONTROL
P3.4/T0
TL0
(8 BITS)
INTERRUPT
C/T = 0
C/T = 1
RELOAD
TH0
(8 BITS)
GATE
P3.2/INT0
TR0
Figure 28. Timer/Counter 0, Mode 2
Mode 3 (Two 8-Bit Timer/Counters)
Mode 3 has different effects on Timer 0 and Timer 1. Timer 1 in
Mode 3 simply holds its count. The effect is the same as setting
TR1 = 0. Timer 0 in Mode 3 establishes TL0 and TH0 as two
separate counters. This configuration is shown in Figure 29.
TL0 uses the Timer 0 control bits: C/T, Gate, TR0,
INT0, and
TF0. TH0 is locked into a timer function (counting machine
cycles) and takes over the use of TR1 and TF1 from Timer 1.
Thus, TH0 now controls the Timer 1 interrupt. Mode 3 is
provided for applications requiring an extra 8-bit timer or counter.
When Timer 0 is in Mode 3, Timer 1 can be turned on and off by
switching it out of, and into, its own Mode 3, or can still be used
by the serial interface as a baud rate generator. In fact, it can be used
in any application not requiring an interrupt from Timer 1 itself.
12
CORE
CLK
TL0
(8 BITS)
TF0
INTERRUPT
CONTROL
P3.4/T0
C/T = 0
C/T = 1
TH0
(8 BITS)
CORE
CLK/12
TR1
CORE
CLK/12
CONTROL
GATE
P3.2/INT0
TR0
TF1
INTERRUPT
Figure 29. Timer/Counter 0, Mode 3
TIMER/COUNTERS 0 AND 1 OPERATING MODES
The following paragraphs describe the operating modes for
Timer/Counters 0 and 1. Unless otherwise noted, it should be
assumed that these modes of operation are the same for Timer 0
as for Timer 1.
Mode 0 (13-Bit Timer/Counter)
Mode 0 configures an 8-bit timer/counter with a divide-by-32
prescaler. Figure 26 shows Mode 0 operation.
12
CORE
CLK
P3.4/T0
GATE
P3.2/INT0
TR0
TF0
CONTROL
TL0
(5 BITS)
TH0
(8 BITS)
INTERRUPT
C/T = 0
C/T = 1
Figure 26. Timer/Counter 0, Mode 0
In this mode, the timer register is configured as a 13-bit register. As
the count rolls over from all 1s to all 0s, it sets the timer overflow
flag TF0. The overflow flag, TF0, can then be used to request
an interrupt. The counted input is enabled to the timer when
TR0 = 1 and either Gate = 0 or
INT0 = 1. Setting Gate = 1 allows
the timer to be controlled by external input
INT0 to facilitate
pulsewidth measurements. TR0 is a control bit in the special
function register TCON; Gate is in TMOD. The 13-bit register
consists of all eight bits of TH0 and the lower five bits of TL0.
The upper three bits of TL0 are indeterminate and should be
ignored. Setting the run flag (TR0) does not clear the registers.
Mode 1 (16-Bit Timer/Counter)
Mode 1 is the same as Mode 0, except that the timer register is
running with all 16 bits. Mode 1 is shown in Figure 27.
12
CORE
CLK
TF0
CONTROL
P3.4/T0
TL0
(8 BITS)
TH0
(8 BITS)
INTERRUPT
C/T = 0
C/T = 1
GATE
P3.2/INT0
TR0
Figure 27. Timer/Counter 0, Mode 1
F
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