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AT87C5111-TDSIL Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT87C5111-TDSIL Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 86 page  11 AT8xC5111 4190A–8051–11/02 Reset value = 0XXX X001b Not bit addressable Clock Selection Register The clock selection register is used to define the clock system behavior Table 3. CKSEL - Clock Selection Register (85h) Reset value = XXXX XXX 1 b Not bit addressable 2SCLKT0 Sub Clock Timer0 Cleared by software to select T0 pin Set by software to select T0 Sub Clock 1OSCBEN Enable RC oscillator This bit is used to enable the high-speed RC oscillator 0: The oscillator is disabled 1: The oscillator is enabled. 0OSCAEN Enable crystal oscillator This bit is used to enable the crystal oscillator 0: The oscillator is disabled 1: The oscillator is enabled. Bit Number Bit Mnemonic Description 765 43210 ------ CKS Bit Number Bit Mnemonic Description 7- Reserved The value read from this bit is indeterminate. Do not set this bit. 6- Reserved The value read from this bit is indeterminate. Do not set this bit. 5- Reserved The value read from this bit is indeterminate. Do not set this bit. 4- Reserved The value read from this bit is indeterminate. Do not set this bit. 3- Reserved The value read from this bit is indeterminate. Do not set this bit. 2- Reserved The value read from this bit is indeterminate. Do not set this bit. 1- Reserved The value read from this bit is indeterminate. Do not set this bit. 0CKS Active oscillator selection This bit is used to select the active oscillator. 1: The crystal oscillator is selected. 0: The high-speed RC oscillator is selected. |
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