Rainbow-electronics ATmega8HVD Manuel d'utilisateur télécharger pdf (Page 118)

118

8052B–AVR–09/08

ATmega4HVD/8HVD

• Bit 1 – DFE: Discharge FET Enable

When the DFE bit is cleared (zero), the Discharge FET will be disabled regardless of the state

of the Battery Protection circuitry. When this bit is set (one), the Discharge FET is enabled.

This bit will automatically be cleared by the CBP circuitry when Current Protection is activated.

When this bit is cleared, Short-circuit, Discharge High-current and Discharge Over-current are

disabled regardless of the settings in the BPCR Register.

• Bit 0 – CFE: Charge FET Enable

When the CFE bit is cleared (zero), the Charge FET will be disabled regardless of the state of

the Battery Protection circuitry. When this bit is set (one), the Charge FET is enabled. This bit

will automatically be cleared by the CBP circuitry when Current Protection is activated. When

this bit is cleared and the DUVRD bit is set, Charge High-current Protection and Charge Over-

current Protection are disabled regardless of the settings in the BPCR Register. When the

DUVRD bit is cleard, the charge FET will be enabled by DUVT mode regardless of the CFE

status.

Note: Due to synchronization of parameters between clock domains, a guard time of 3 ULP oscillator

cycles + 3 CPU clock cycles is required between each time the FCSR register is written. Any

writing to the FCSR register during this period will be ignored.

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Rainbow-electronics ATmega8HVD Manuel d'utilisateur Page 118