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TWI_put_ack:
sbi DDRC,SCL ; force SCL low
rcall TWI_hp_delay ; half period delay
cbi DDRC,SDA ; release SDA
; sbi DDRC,SDA ; force SDA low
rcall TWI_hp_delay ; half period delay
cbi DDRC,SCL ; release SCL
rcall TWI_hp_delay ; half period delay
ret
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