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| 型號： | C8051F231-GQ |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 30/146頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 8051 MCU 8K FLASH 32LQFP |
| 產(chǎn)品培訓(xùn)模塊： | Serial Communication Overview |
| 標準包裝： | 250 |
| 系列： | C8051F2xx |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 25MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，WDT |
| 輸入/輸出數(shù)： | 22 |
| 程序存儲器容量： | 8KB（8K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 3.6 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 32-LQFP |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 623 (CN2011-ZH PDF) |
| 其它名稱： | 336-1243 |
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C8051F2xx
Rev. 1.6
125
17. Timers
The CIP-51 implements three, 16-bit counter/timers comparable with those found in the standard 8051
MCU's. These can be used to measure time intervals, count external events and generate periodic inter-
rupt requests. Timer 0 and Timer 1 are nearly identical and have four primary modes of operation. Timer
2 offers additional capabilities not available in Timers 0 and 1, such as capture and baud rate generation.
When functioning as a timer, the counter/timer registers are incremented on each clock tick. Clock ticks
are derived from the system clock divided by either one or twelve as specified by the Timer Clock Select
bits (T2M–T0M) in CKCON. The twelve-clocks-per-tick option provides compatibility with the older gener-
ation of the 8051 family. Applications that require a faster timer can use the one-clock-per-tick option.
When functioning as a counter, a counter/timer register is incremented on each high-to-low transition at the
selected input pin (P0.4/T0, P0.5/T1, or P0.6/T2. Events with a frequency of up to one-fourth the system
clock's frequency can be counted. The input signal need not be periodic, but it should be held at a given
level for at least two full system clock cycles to ensure the level is sampled.
17.1. Timer 0 and Timer 1
Timer 0 and Timer 1 are accessed and controlled through SFR's. Each counter/timer is implemented as a
16-bit register accessed as two separate bytes: a low byte (TL0 or TL1) and a high byte (TH0 or TH1). The
Counter/Timer Control (TCON) register is used to enable Timer 0 and Timer 1 as well as indicate their sta-
tus. Both counter/timers operate in one of four primary modes selected by setting the Mode Select bits
M1–M0 in the Counter/Timer Mode (TMOD) register. Each timer can be configured independently. Follow-
ing is a detailed description of each operating mode.
17.1.1. Mode 0: 13-bit Counter/Timer
Timer 0 and Timer 1 operate as a 13-bit counter/timer in Mode 0. The following describes the configuration
and operation of Timer 0. However, both timers operate identically and Timer 1 is configured in the same
manner as described for Timer 0.
The TH0 register holds the eight MSB's of the 13-bit counter/timer. TL0 holds the five LSBs in bit positions
TL0.4–TL0.0. The three upper bits of TL0 (TL0.7–TL0.5) are indeterminate and should be masked out or
ignored when reading. As the 13-bit timer register increments and overflows from 0x1FFF (all ones) to
0x0000, the timer overflow flag TF0 (TCON.5) is set and an interrupt will occur if enabled.
The C/T0 bit (TMOD.2) selects the counter/timer's clock source. Clearing C/T selects the system clock as
the input for the timer. When C/T0 is set to logic 1, high-to-low transitions at the selected input pin incre-
ment the timer register. (Refer to section 14 for information on selecting and configuring external I/O pins.)
Setting the TR0 bit (TCON.4) enables the timer when either GATE0 (TMOD.3) is 0 or the input signal /INT0
is logic-level one. Setting GATE0 to logic 1 allows the timer to be controlled by the external input signal
/INT0, facilitating pulse width measurements.
Timer 0 and Timer 1:
Timer 2:
13-bit counter/timer
16-bit counter/timer with auto-reload
16-bit counter/timer
16-bit counter/timer with capture
8-bit counter/timer with auto-reload
Baud rate generator
Two 8-bit counter/timers (Timer 0 only)
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相關(guān)代理商/技術(shù)參數(shù) |
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| C8051F231-GQR | 功能描述:8位微控制器 -MCU 8KB 32Pin MCU Tape and Reel RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F231R | 功能描述:8位微控制器 -MCU T-0 32 Pin RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F236 | 功能描述:8位微控制器 -MCU 8KB 1KRam RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F236-GQ | 功能描述:8位微控制器 -MCU 8KB 1KRam 48P MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| C8051F236-GQR | 功能描述:8位微控制器 -MCU 8KB 1KRam 48Pin MCU Tape and Reel RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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