ATmega16HVB datasheet(131/273 Pages) ATMEL

131 / 273 page

131

8042A–AVR–07/09

ATmega16HVB/32HVB

•

When disabling the Charge-FET the Charger Detect module is automatically enabled and a

charger appear to be connected.

22.4

22.4.1

CHGDCSR - Charger Detect Control and Status Register

• Bit 7:5 - Res: Reserved

These bits are reserved bits and will always read as zero.

• Bit 4 - BATTPVL: BATT pin Voltage Level

BATTPVL will read one as long when the Charger Detect module is enabled and the BATT pin

voltage is above the VPOT level. Otherwise the BATTPVL will read zero.

• Bit 3:2 - CHGDISC1:0: Charger Detect Interrupt Sense Control

Edges in the CHARGER_PRESENT signal shown in Figure 22-1 on page 129 are used to acti-

vate a Charger Detect Interrupt if the SREG I-flag and the interrupt enable bit in CHGDCSR are

set. By writing the CHGDISC bits to the values shown in Table 22-1 on page 131 the condition

generating interrupt is configured. When changing the CHGDISC bits, an interrupt can occur.

Therefore, it is recommended to first disable the Interrupt by clearing its CHGDIE bit in the

CHGDICSR Register. Finally, the Charger Detect interrupt flag should be cleared by writing a

logical one to CHGDIF bit before the interrupt is re-enabled.

• Bit 1 - CHGDIF: Charger Detect Interrupt Flag

Depending on the configuration of the CHGDISC bits in the CHGDCSR, this bit is set when a

charger is either connected or disconnected. The Charger Detect Interrupt is executed if the

CHGDIE bit and the I-bit in SREG are set. This bit is cleared by hardware when executing the

corresponding interrupt handling vector or alternatively by writing a logical one to the CHGDIF. It

is recommended to write this bit to one when setting CHGDIE.

• Bit 0 - CHGDIE: Charger Detect Interrupt Enable

When the CHGDIE bit is set (one), and the I-bit in the Status Register is set (one), the Charger

Detect Interrupt is enabled.

Bit

43210

(0xD4)

BATTPVL

CHGDISC1

CHGDISC0

CHGDIF

CHGDIE

CHGDCSR

Read/Write

R/W

Initial Value

00000

Table 22-1.

Charger Detect Interrupt Sense Control.

CHGISC1:0

Detection

Charger Connect

Charger Disconnect

Charger Connect/Disconnect

None

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