Hasituppāda-citta: lit. 'consciousness producing mirth' smile, is found in the Abhidhammattha Sangaha as a name for the joyful mind-consciousness element manoviññāna-dhātu Tab. I. 72 arising as functional consciousness independent of kamma kiriya-citta only in the Arahant.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.