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參數(shù)資料
| 型號(hào)： | AT89LP52-20JU |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 59/117頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 8051 8K FLASH SPI 44PLCC |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 系列： | 89LP |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 20MHz |
| 連通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 36 |
| 程序存儲(chǔ)器容量： | 8KB（8K x 8） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 256 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.4 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | * |
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46
3709D–MICRO–12/11
AT89LP51/52
11. Timer 0 and Timer 1
The AT89LP51/52 has two 16-bit Timer/Counters, Timer 0 and Timer 1, with the following
features:
Two independent 16-bit timer/counters with 8-bit reload registers
UART baud rate generation using Timer 1
Output pin toggle on timer overflow
Split timer mode allows for three separate timers (2 8-bit, 1 16-bit)
Gated modes allow timers to run/halt based on an external input
Timer 0 and Timer 1 have similar modes of operation. As timers, the timer registers normally
increase every clock cycle. Thus, the registers count clock cycles. The timer rate can be pres-
caled by a value between 1 and 16 using the Timer Prescaler (see Table 6-2 on page 31). Both
Timers share the same prescaler. In Compatibility mode CDV defaults to 2, so a clock cycle con-
sists of two oscillator periods,and the prescaler defaults to 6 making the count rate equal to 1/12
of the oscillator frequency. By default in Fast mode CDV = 0 and TPS =0 so the count rate is
equal to the oscillator frequency.
As counters, the timer registers are incremented in response to a 1-to-0 transition at the corre-
sponding input pins, T0 or T1. In Fast mode the external input is sampled every clock cycle.
When the samples show a high in one cycle and a low in the next cycle, the count is incre-
mented. The new count value appears in the register during the cycle following the one in which
the transition was detected. Since 2 clock cycles are required to recognize a 1-to-0 transition,
the maximum count rate is 1/2 of the system frequency. There are no restrictions on the duty
cycle of the input signal, but it should be held for at least one full clock cycle to ensure that a
given level is sampled at least once before it changes.
In Compatibility mode the counter input sampling is controlled by the prescaler. Since TPS
defaults to 6 in this mode, the pins are sampled every six system clocks. Therefore the input sig-
nal should be held for at least six clock cycles to ensure that a given level is sampled at least
once before it changes.
Furthermore, the Timer or Counter functions for Timer 0 and Timer 1 have four operating modes:
13-bit timer, 16-bit timer, 8-bit auto-reload timer, and split timer. The control bits C/T in the Spe-
cial Function Register TMOD select the Timer or Counter function. The bit pairs (M1, M0) in
TMOD select the operating modes.
Table 11-1.
Timer 0/1 Register Summary
Name
Address
Purpose
Bit-Addressable
TCON
88H
Control
Y
TMOD
89H
Mode
N
TL0
8AH
Timer 0 low-byte
N
TL1
8BH
Timer 1 low-byte
N
TH0
8CH
Timer 0 high-byte
N
TH1
8DH
Timer 1 high-byte
N
TCONB
91H
Mode
N
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT89LP52-20MU | 功能描述:8位微控制器 -MCU Single-Cycle 8051 8K ISP Flash 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(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 |
| AT89LP52-20PU | 功能描述:8位微控制器 -MCU Single-Cycle 8051 8K ISP Flash 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(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 |
| AT89LP6440-20AU | 功能描述:8位微控制器 -MCU Single-Cycle 8051 64K ISP Flash 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 |
| AT89LP6440-20JU | 功能描述:8位微控制器 -MCU Single-Cycle 8051 64K ISP Flash 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 |
| AT89LP6440-20MU | 功能描述:8位微控制器 -MCU Single-Cycle 8051 64K ISP Flash 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 |
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