参数资料
型号: AT89LP51-20PU
厂商: Atmel
文件页数: 60/117页
文件大小: 0K
描述: MCU 8051 4K FLASH 20MHZ
标准包装: 10
系列: 89LP
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: EBI/EMI,I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 36
程序存储器容量: 4KB(4K x 8)
程序存储器类型: 闪存
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 2.4 V ~ 5.5 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 40-DIP(0.600",15.24mm)
包装: 管件
47
3709D–MICRO–12/11
AT89LP51/52
11.1
Mode 0 – 13-bit Timer/Counter
Both Timers in Mode 0 are 8-bit Counters with a divide-by-32 prescaler. Figure 11-1 shows the
Mode 0 operation as it applies to Timer 1. As the count rolls over from all “1”s to all “0”s, it sets
the Timer interrupt flag TF1. The counter input is enabled to the Timer when TR1 = 1 and either
GATE1 = 0 or INT1 =1. Setting GATE1 = 1 allows the Timer to be controlled by external input
INT1, to facilitate pulse width measurements. TR1 is a control bit in the Special Function Regis-
ter TCON. GATE1 is in TMOD. The 13-bit register consists of all 8 bits of TH1 and the lower 5
bits of TL1. The upper 3 bits of TL1 are indeterminate and should be ignored. Setting the run flag
(TR1) does not clear the registers.
Figure 11-1. Timer/Counter 1 Mode 0: 13-bit Counter
Mode 0 operation is the same for Timer 0 as for Timer 1, except that TR0, TF0, GATE0 and
INT0 replace the corresponding Timer 1 signals in Figure 11-1. There are two different C/T bits,
one for Timer 1 (TMOD.6) and one for Timer 0 (TMOD.2).
11.2
Mode 1 – 16-bit Timer/Counter
In Mode 1 the Timers are configured for 16-bit operation. The Timer register is run with all 16 bits
and the clock is applied to the combined high and low timer registers (TH1/TL1). As clock pulses
are received, the timer counts up: 0000H, 0001H, 0002H, etc. An overflow occurs on the
FFFFH-to-0000H transition, upon which the overflow flag bit in TCON is set. See Figure 11-2.
Mode 1 operation is the same for Timer/Counter 0.
Figure 11-2. Timer/Counter 1 Mode 1: 16-bit Counter
Mode 0:
Time-out Period
8192
System Frequency
--------------------------------------------------
TPS
1
+
()
×
=
OSC
T1 Pin
TR1
GATE1
INT1 Pin
TL1
(5 Bits)
Control
Interrupt
C/T = 0
C/T = 1
TH1
(8 Bits)
TF1
÷CDV
÷TPS
Mode 1:
Time-out Period
65536
System Frequency
--------------------------------------------------
TPS
1
+
()
×
=
OSC
T1 Pin
TR1
GATE1
INT1 Pin
TL1
(8 Bits)
Control
Interrupt
C/T = 0
C/T =1
TH1
(8 Bits)
TF1
÷CDV
÷TPS
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AT89LP51ED2-20MU 功能描述:8位微控制器 -MCU 64KB 20MHz 2.4V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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