参数资料
型号: T89C51CC02UA-TDSIM
厂商: Atmel
文件页数: 18/159页
文件大小: 0K
描述: IC 8051 MCU FLASH 16K 24-SOIC
标准包装: 31
系列: AT89C CAN
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: CAN,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 20
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 512 x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 24-SOIC(0.295",7.50mm 宽)
包装: 管件
配用: AT89STK-06-ND - KIT DEMOBOARD 8051 MCU W/CAN
其它名称: T89C51CC02UATDSIM
114
AT/T89C51CC02
4126L–CAN–01/08
Programmable
Counter Array (PCA)
The PCA provides more timing capabilities with less CPU intervention than the standard
timer/counters. Its advantages include reduced software overhead and improved accu-
racy. The PCA consists of a dedicated timer/counter which serves as the time base for
an array of two compare/capture modules. Its clock input can be programmed to count
any of the following signals:
PCA clock frequency/6 (See “clock” section)
PCA clock frequency/2
Timer 0 overflow
External input on ECI (P1.2)
Each compare/capture modules can be programmed in any one of the following modes:
Rising and/or falling edge capture,
Software timer
High-speed output
Pulse width modulator
When the compare/capture modules are programmed in capture mode, software timer,
or high speed output mode, an interrupt can be generated when the module executes its
function. Both modules and the PCA timer overflow share one interrupt vector.
The PCA timer/counter and compare/capture modules share Port 1 for external I/Os.
These pins are listed below. If the pin is not used for the PCA, it can still be used for
standard I/O.
PCA Timer
The PCA timer is a common time base for both modules (See Figure 9). The timer count
source is determined from the CPS1 and CPS0 bits in the CMOD SFR (See Table 8)
and can be programmed to run at:
1/6 the PCA clock frequency.
1/2 the PCA clock frequency.
The Timer 0 overflow.
The input on the ECI pin (P1.2).
PCA Component
External I/O Pin
16-bit Counter
P1.2/ECI
16-bit Module 0
P1.3/CEX0
16-bit Module 1
P1.4/CEX1
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