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T84C5112-RKFIL Datasheet(PDF) 13 Page - ATMEL Corporation |
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T84C5112-RKFIL Datasheet(HTML) 13 Page - ATMEL Corporation |
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13 / 97 page  Rev. B - November 10, 2000 13 Preliminary T80C5112 6.6.3. Clock selection register The clock selectionl register is used to define the clock system behavior CKSEL - Clock Selection Register (85h) Reset Value = XXXX XXX "RST_OSC" b Not bit addressable 6.6.4. Clock prescaler register This register is used to reload the clock prescaler of the CPU and peripheral clock. CKRL - Clock prescaler Register (97h) Reset Value = 1111 1111b Not bit addressable 6.6.5. Clock control register This register is used to control the X2 mode of the CPU and peripheral clock. Table 2. CKCON0 Register 7 6 5 4 3 2 1 0 - - - - - - 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. 0 CKS 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. 7 6 5 4 3 2 1 0 M Bit Number Bit Mnemonic Description 7:0 CKRL 0000 0000b: Division factor equal 512 1111 1111b: Division factor equal 2 M: Division factor equal 2*(256-M) |
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