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ATmega162V-8AI 数据表(PDF) 39 Page - ATMEL Corporation |
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ATmega162V-8AI 数据表(HTML) 39 Page - ATMEL Corporation |
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39 / 324 page  39 2513K–AVR–07/09 ATmega162/V Time-out. For more information on the pre-programmed calibration value, see the section “Cali- bration Byte” on page 234. Note: 1. The device is shipped with this option selected. When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in Table 12. XTAL1 and XTAL2 should be left unconnected (NC). Note: 1. The device is shipped with this option selected. Oscillator Calibration Register – OSCCAL • Bit 7 – Res: Reserved Bit This bit is reserved bit in the ATmega162, and will always read as zero. • Bits 6..0 – CAL6..0: Oscillator Calibration Value Writing the calibration byte to this address will trim the Internal Oscillator to remove process vari- ations from the Oscillator frequency. This is done automatically during Chip Reset. When OSCCAL is zero, the lowest available frequency is chosen. Writing non-zero values to this regis- ter will increase the frequency of the Internal Oscillator. Writing 0x7F to the register gives the highest available frequency. The calibrated Oscillator is used to time EEPROM and Flash access. If EEPROM or Flash is written, do not calibrate to more than 10% above the nominal fre- quency. Otherwise, the EEPROM or Flash write may fail. Table 11. Internal Calibrated RC Oscillator Operating Modes CKSEL3:0 Nominal Frequency 0010 (1) 8.0 MHz Table 12. Start-up Times for the Internal Calibrated RC Oscillator Clock Selection SUT1:0 Start-up Time from Power- down and Power-save Additional Delay from Reset (VCC = 5.0V) Recommended Usage 00 6 CK – BOD enabled 01 6 CK 4.1 ms Fast rising power 10(1) 6 CK 65 ms Slowly rising power 11 Reserved Bit 765 4321 0 – CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0 OSCCAL Read/Write R R/W R/W R/W R/W R/W R/W R/W Initial Value 0 Device Specific Calibration Value |
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