參數(shù)資料
型號(hào): AT89C5132-ROTIL
廠商: Atmel
文件頁(yè)數(shù): 127/182頁(yè)
文件大小: 0K
描述: IC 8051 MCU FLASH 64K USB 80TQFP
標(biāo)準(zhǔn)包裝: 450
系列: AT89C513x
核心處理器: C52X2
芯體尺寸: 8-位
速度: 20MHz
連通性: IDE/ATAPI,I²C,MMC,PCM,SPI,UART/USART,USB
外圍設(shè)備: I²S,POR,WDT
輸入/輸出數(shù): 44
程序存儲(chǔ)器容量: 64KB(64K x 8)
程序存儲(chǔ)器類(lèi)型: 閃存
EEPROM 大小: 4K x 8
RAM 容量: 2.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.3 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 2x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-LQFP
包裝: 托盤(pán)
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49
4173E–USB–09/07
AT89C5132
12. Timers/Counters
The AT89C5132 implement two general-purpose, 16-bit Timers/Counters. They are identified as
Timer 0 and Timer 1, and can be independently configured to operate in a variety of modes as a
Timer or as an event Counter. When operating as a Timer, the Timer/Counter runs for a pro-
grammed length of time, then issues an interrupt request. When operating as a Counter, the
Timer/Counter counts negative transitions on an external pin. After a preset number of counts,
the Counter issues an interrupt request.
The various operating modes of each Timer/Counter are described in the following sections.
12.1
Timer/Counter Operations
For instance, a basic operation is Timer registers THx and TLx (x = 0, 1) connected in cascade
to form a 16-bit Timer. Setting the run control bit (TRx) in TCON register (see Table 40) turns the
Timer on by allowing the selected input to increment TLx. When TLx overflows it increments
THx; when THx overflows it sets the Timer overflow flag (TFx) in TCON register. Setting the TRx
does not clear the THx and TLx Timer registers. Timer registers can be accessed to obtain the
current count or to enter preset values. They can be read at any time but TRx bit must be
cleared to preset their values, otherwise the behavior of the Timer/Counter is unpredictable.
The C/Tx# control bit selects Timer operation or Counter operation by selecting the divided-
down peripheral clock or external pin Tx as the source for the counted signal. TRx bit must be
cleared when changing the mode of operation, otherwise the behavior of the Timer/Counter is
unpredictable.
For Timer operation (C/Tx# = 0), the Timer register counts the divided-down peripheral clock.
The Timer register is incremented once every peripheral cycle (6 peripheral clock periods). The
Timer clock rate is FPER/6, i.e., FOSC/12 in standard mode or FOSC/6 in X2 mode.
For Counter operation (C/Tx# = 1), the Timer register counts the negative transitions on the Tx
external input pin. The external input is sampled every peripheral cycles. When the sample is
high in one cycle and low in the next one, the Counter is incremented. Since it takes 2 cycles (12
peripheral clock periods) to recognize a negative transition, the maximum count rate is FPER/12,
i.e., FOSC/24 in standard mode or FOSC/12 in X2 mode. There are no restrictions on the duty
cycle of the external input signal, but to ensure that a given level is sampled at least once before
it changes, it should be held for at least one full peripheral cycle.
12.2
Timer Clock Controller
As shown in Figure 12-1, the Timer 0 (FT0) and Timer 1 (FT1) clocks are derived from either the
peripheral clock (FPER) or the oscillator clock (FOSC) depending on the T0X2 and T1X2 Bits in
CKCON register. These clocks are issued from the Clock Controller block as detailed in Section
’CKCON Register’, page 14. When T0X2 or T1X2 bit is set, the Timer 0 or Timer 1 clock fre-
quency is fixed and equal to the oscillator clock frequency divided by 2. When cleared, the Timer
clock frequency is equal to the oscillator clock frequency divided by 2 in standard mode or to the
oscillator clock frequency in X2 mode.
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AT89C5132-ROTUL 功能描述:8位微控制器 -MCU USB 64K FLASH 4K 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
AT89C51-33AC 功能描述:8位微控制器 -MCU Microcontroller 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
AT89C51-33AI 功能描述:8位微控制器 -MCU Microcontroller 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
AT89C51-33JI 功能描述:8位微控制器 -MCU Microcontroller 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
AT89C51-33PC 功能描述:8位微控制器 -MCU Microcontroller 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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