ATmega16HVB datasheet(201/273 Pages) ATMEL

201 / 273 page

201

8042A–AVR–07/09

ATmega16HVB/32HVB

2. FOSCCAL setting used to smooth the transition from one segment to the next when calibrating

the Fast RC oscillator.

3. 8 prescaled Slow RC periods in µs using the Oscillator Sampling Interface (@T

HOT°C).

4. Slow RC oscillator frequency temperature drift prediction value.

5. ULP RC oscillator frequency in kHz (@ T

HOT°C).

6. Slow RC oscillator frequency in kHz (@T

HOT°C).

7. ULP RC oscillator frequency temperature drift prediction value.

8. 8 prescaled ULP RC periods in µs using the Oscillator Sampling Interface (@T

HOT°C).

9. Calibration word used to calculate the absolute temperature in Kelvin from a VTEMP

conversion.

10. Calibration word used to compensate for gain error in V-ADC Cells.

11. Calibration byte used to compensate for offset in V-ADC Cells.

12. Calibration word used to compensate for gain error in ADC0.

13. Calibration word used to compensate for gain error in ADC1.

14. Calibration byte used to compensate for offset in ADC0 and ADC1.

15. Hot temperature used for factory calibration in °C.

All other addresses are reserved for future use.

29.8.10

SPMCSR writing restrictions

Writing any other combination than “100001”, “010001”, “001001”, “000101”, “000011” or

“000001” in the lower six bits will have no effect.

SPMCSR is locked for writing under the following conditions:

• One or more of the bits 5:0 in SPMCSR is set to 1

• During EEPROM write (status bit EEWE in EECR is set)

SPMCSR will be cleared at the following events:

• on completion of successful execution the following instructions:

– LPM with LBSET and SPMEN set

– SPM with LBSET and SPMEN set

– SPM with PGERS and SPMEN set

– SPM with PGWRT and SPMEN set

– SPM with SPMEN set

• six cycles after writing SPMCSR if any other or no LPM/SPM is executed

29.8.11

Programming Time for Flash when Using SPM

The Fast RC Oscillator is used to time Flash accesses. Table 29-4 shows the typical program-

ming time for Flash accesses from the CPU.

Note:

1. Minimum and maximum programming time is per individual operation.

Table 29-4.

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

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