BBC Instruction in intel 80c196

[Nigga]

Hi, while seeing assembly code of intel's 80c196 microcontroller i came across this line :

call check_mu
bbc flag_1, 1, id_cmd

Can anybody please tell what is meaning/fullform of BBC instructionand tell what does it do ?
I saw this datasheet, but nowhere it is defined :
http://www.milton.arachsys.com/nj71/pdf/Roland/dev96/tasking80196assemblerguide.pdf
regards,
Nigga