参数资料
型号: AT89S8253-24AC
厂商: Atmel
文件页数: 6/60页
文件大小: 0K
描述: IC 8051 MCU FLASH 12K 44TQFP
标准包装: 160
系列: 89S
核心处理器: 8051
芯体尺寸: 8-位
速度: 24MHz
连通性: SPI,UART/USART
外围设备: POR,WDT
输入/输出数: 32
程序存储器容量: 12KB(12K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 256 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 44-TQFP
包装: 托盘
14
3286P–MICRO–3/10
AT89S8253
9.
Timer 0 and 1
Timer 0 and Timer 1 in the AT89S8253 operate the same way as Timer 0 and Timer 1 in the
AT89S51 and AT89S52. For more detailed information on the Timer/Counter operation, please
click on the document link below:
10. Timer 2
Timer 2 is a 16-bit Timer/Counter that can operate as either a timer or an event counter. The
type of operation is selected by bit C/T2 in the SFR T2CON (see Table 10-2 on page 15). Timer
2 has three operating modes: capture, auto-reload (up or down counting), and baud rate gener-
ator. The modes are selected by bits in T2CON, as shown in Table 10-2.
Timer 2 consists of two 8-bit registers, TH2 and TL2. In the Timer function, the TL2 register is
incremented every machine cycle. Since a machine cycle consists of 12 oscillator periods, the
count rate is 1/12 of the oscillator frequency.
In the Counter function, the register is incremented in response to a 1-to-0 transition at its corre-
sponding external input pin, T2. In this function, the external input is sampled during S5P2 of
every machine cycle. When the samples show a high in one cycle and a low in the next cycle,
the count is incremented. The new count value appears in the register during S3P1 of the cycle
following the one in which the transition was detected. Since two machine cycles (24 oscillator
periods) are required to recognize a 1-to-0 transition, the maximum count rate is 1/24 of the
oscillator frequency. To ensure that a given level is sampled at least once before it changes, the
level should be held for at least one full machine cycle.
Table 10-1.
Timer 2 Operating Modes
RCLK + TCLK
CP/RL2
TR2
MODE
0
1
16-bit Auto-reload
0
1
16-bit Capture
1
X
1
Baud Rate Generator
X
0
(Off)
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