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T80C5112-RKFEV 数据表(PDF) 12 Page - ATMEL Corporation |
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T80C5112-RKFEV 数据表(HTML) 12 Page - ATMEL Corporation |
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12 / 97 page  12 Rev. B - November 10, 2000 Preliminary T80C5112 Initial value after erasing : 1111 111X 6.6.2. Clock control register The clock control register is used to define the clock system behavior OSCCON - Clock Control Register (86h) Reset Value = 0XXX X0 "RST_OSC" "RST_OSC" b Not bit addressable 4 RST_OSC Selected oscillator at reset This bit is used to deÞne the value of some bits controlling the oscillator activity at reset: 1: The crystal oscillator is sectected and active 0: The RC oscillator is selected; it is also active if the WDRC is inactive. 3 XT_SP Crystal oscillator speed This bit is used to deÞne the performance of the crystal oscillator. 1: High speed, up to 33 MHz 0: Low speed, low power, optimised for 32 kHz. 2 EXT_RST External Reset This bit deÞnes the behavior of the P3.6/RST pin 1: P3.6/RST is the reset pin 0: P3.6/RST is an input pin 1 OSCC_OFF Control for watchdog RC oscillator This bit is used to switch the watchdog RC oscillator and the watchdog source 1: WDRC oscillator is off; the watchdog is clocked by the main oscillator. 0: WDRC oscillator is on and clock the watchdog 0 - Reserved The value read from this bit is indeterminate. Do not reset this bit. 7 6 5 4 3 2 1 0 - - - - - SCLKT0 OSCBEN OSCAEN 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 SCLKT0 Sub Clock Timer0 Cleared by software to select T0 pin Set by software to select T0 Sub Clock 1 OSCBEN Enable RC oscillator This bit is used to enable the high speed RC oscillator 0: The oscillator is disabled 1: The oscillator is enabled. 0 OSCAEN 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 |
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