Rainbow Electronics ATmega8HVD - Manual (Page 125)

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8052B–AVR–09/08
ATmega4HVD/8HVD
Notes: 1. Default FOSCCAL value after reset.
2. FOSCCAL setting used to smooth the transition from one segment to the next when calibrat-
ing the Fast RC oscillator.
3. 8 prescaled Slow RC periods in µs using the Oscillator Sampling Interface [@ HOT].
4. Characterized Slow RC oscillator frequency temperature drift prediction value.
5. Slow RC oscillator frequency in kHz [@ HOT].
6. ULP RC oscillator frequency in kHz [@ HOT].
7. BattProt Adjust Factor is an adjustment for additional battery protection trigger level accu-
racy, signed byte value. (Negative value means right shift, positive value means left shift.)
8. Calibration Word used to calculate the absolute temperature in Kelvin from a VTEMP
conversion.
9. Calibration Word used to compensate for gain error in ADC Cell input 0.
10. Calibration Byte used to compensate for offset in ADC Cell input 0.
11. Calibration Word used to compensate for gain error in ADC input ADC0.
12. Calibration Byte used to compensate for offset in ADC input ADC0.
13. Calibration Temperature in °C.
All other addresses are reserved for future use.
23.5.6 Programming Time for Flash when Using SPM
The Calibrated Fast RC Oscillator is used to time Flash accesses. Table 23-2 shows the typi-
cal programming time for Flash accesses from the CPU.
Note: 1. Minimum and maximum programming time is per individual operation.
ADC Cell Gain Calibration Word L 14H
ADC Cell Gain Calibration Word H (9) 15H
ADC Cell Offset (10) 16H
Reserved 17H
ADC ADC0 Gain Calibration Word L 18H
ADC ADC0 Gain Calibration Word H (11) 19H
ADC ADC0 Offset (12) 1AH
Reserved 1BH
HOT TEMP (13) 1CH
Reserved 1DH
Table 23-1. Signature Row Addressing (Continued)
Signature Byte Description Z-Pointer Address
Table 23-2. SPM Programming Time (1)
Symbol Min Programming Time Max Programming Time
Flash write (Page Erase, Page Write,
and write Lock bits by SPM)
3.7 ms 4.5 ms