name: HT99U410B function: Enhanced Cordless Phone Controller package: SSOP48,48 manufacturer: Holtek +--()--+ NC | 1 48| NC NC | 2 47| NC PD0(KT) | 3 46| PA7(C8B) PD1(DOUT) | 4 45| PA6(C7B) PB0(R1B) | 5 44| PA5(C6B) PB1(R2B) | 6 43| PA4(C5B) PB2(R3B) | 7 42| PA3(C4B) PB3(R4B) | 8 41| PA2(C3B) PB4(R5B) | 9 40| PA1(C2B) PB5 |10 39| PA0(C1B) PB6 |11 38| PC7 PB7 |12 37| PC6 PD2(HKSB) |13 36| PC5 PD3(CLOCK) |14 35| PC4(POB) PD4(M/BB) |15 34| PC3(HFO) PD5(HFI) |16 33| PC2(XMUTEB) PD6(MODE) |17 32| DTMF PD7 |18 31| PC1(HDIB) ROSC |19 30| PC0(HDO) X1 |20 29| VSS X2 |21 28| MUSIC VDD |22 27| AIN NC |23 26| NC NC |24 25| NC +------+ This pinout came from the Chipdir: http://www.chipdir.org/