High-speed Output Mode In this mode the CEX output (on port 1) associated w" />
參數(shù)資料
型號: AT89C51RB2-SLSIM
廠商: Atmel
文件頁數(shù): 64/127頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
標(biāo)準(zhǔn)包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
41
AT89C51RB2/RC2
4180E–8051–10/06
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 modules capture registers.
To activate this mode the TOG, MAT, and ECOM bits in the modules CCAPMn SFR
must be set (see Figure 15).
A prior write must be done to CCAPnL and CCAPnH before writing the ECOMn bit.
Figure 15. PCA High-speed Output Mode
Before enabling ECOM bit, CCAPnL and CCAPnH should be set with a non-zero value,
otherwise an unwanted match could occur.
Once ECOM is 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.
CH
CL
CCAPnH
CCAPnL
ECOMn
CCAPMn, n = 0 to 4
0xDA to 0xDE
CAPNn MATn TOGn PWMn ECCFn
CAPPn
16-bit Comparator
Match
CF
CR
CCON
0xD8
CCF4 CCF3
CCF2
CCF1
CCF0
PCA IT
Enable
CEXn
PCA Counter/Timer
Write to
CCAPnH
Reset
Write to
CCAPnL
1
0
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