参数资料
型号: AT89C51ID2-SLSUM
厂商: Atmel
文件页数: 102/157页
文件大小: 0K
描述: IC 8051 MCU FLASH 64K 44PLCC
产品培训模块: MCU Product Line Introduction
标准包装: 972
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: I²C,SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LCC(J 形引线)
包装: 管件
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
49
AT89C51ID2
4289C–8051–11/05
Figure 17. PCA Compare Mode and PCA Watchdog Timer
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non zero value,
otherwise an unwanted match could happen. Writing to CCAPnH will set the ECOM bit.
Once ECOM set, writing CCAPnL will clear ECOM so that an unwanted match doesn’t
occur while modifying the compare value. Writing to CCAPnH will set ECOM. For this
reason, user software should write CCAPnL first, and then CCAPnH. Of course, the
ECOM bit can still be controlled by accessing to CCAPMn register.
High Speed Output Mode In this mode the CEX output (on port 1) associated with the PCA module will toggle
each time a match occurs between the PCA counter and the module's capture registers.
To activate this mode the TOG, MAT, and ECOM bits in the module's CCAPMn SFR
must be set (See Figure 18).
A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.
CH
CL
CCAPnH
CCAPnL
ECOMn
CCAPMn, n = 0 to 4
0xDA t o 0xDE
CAPNn MATn TOGn PWMn ECCFn
CAPPn
16 bit comparator
Match
CCON
0xD8
PCA I T
Enable
PCA counter/ timer
RESET *
CIDL
CPS1 CPS0
ECF
CMOD
0xD9
WDTE
Reset
Write to
CCAPnL
Write t o
CCAPnH
CF
CCF2 CCF1
CCF0
CR
CCF3
CCF4
10
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