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STPC12 数据表(PDF) 36 Page - STMicroelectronics |
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STPC12 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 111 page  STRAP OPTION 36/111 Issue 1.0 - July 24, 2002 3.1.2. STRAP REGISTER 1 This register is read only. STRAP1 Access = 0022h/0023h Regoffset =04Bh 76 543210 MD[40] MD[14] RSV RSV RSV RSV RSV MD[36] This register defaults to the values sampled on the MD pins after reset Bit Number Sampled Mnemonic Description Bits 7-6 MD[40] & MD[14] CPU Clock Multiplication (486 mode): MD14 MD40 1 0 X 1 1 1 X 2 All other settings are reserved HCLK maximum speed is 66MHz and in CPU mode X2. Operation in X1 mode is only guaranteed up to 66MHz. Bits 5-1 Rsv Reserved Bit 0 MD[36] These bits reflect the values sampled on MD[36] and determines the Local Bus Boot device width: 0: 8-bit Boot Device 1: 16-bit Boot Device |
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