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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT89C51ID2-RDTIM 데이터시트(PDF) 15 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM 데이터시트(HTML) 15 Page - ATMEL Corporation |
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15 / 159 page  15 AT89C51ID2 4289A–8051–09/03 Oscillators Overview Two oscillators are available for CPU: • OSCA used for high frequency: Up to 40 MHz • OSCB used for low frequency: 32.768 kHz Several operating modes are available and programmable by software: • to switch OSCA to OSCB and vice-versa • to stop OSCA or OSCB to reduce consumption In order to optimize the power consumption and the execution time needed for a specific task, an internal prescaler feature has been implemented between the selected oscilla- tor and the CPU. Registers Table 15. CKSEL Register CKSEL - Clock Selection Register (85h) Reset Value = 0000 000’HSB.OSC’b (see Hardware Security Byte (HSB)) Not bit addressable 7654 3210 ------- CKS Bit Number Bit Mnemonic Description 7- Reserved 6- Reserved 5- Reserved 4- Reserved 3- Reserved 2- Reserved 1- Reserved 0CKS CPU Oscillator Select Bit: (CKS) Cleared, CPU and peripherals connected to OSCB Set, CPU and peripherals connected to OSCA Programmed by hardware after a Power-up regarding Hardware Security Byte (HSB).HSB.OSC (Default setting, OSCA selected) |
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