HT1632C datasheet - Adafruit

Note:HT1632CX: Dont careA6~A0: RAM addressesD3~D0: RAM dataD/C: Data/command modeDefault: Power on reset defaultAll the bold forms, namely110,101,and100,aremode commands. Among these,100indicates the commandmode ID. If successive commands have been issued, the command mode ID except for the first commandwill be omitted. The source of the tone frequency and of the time base clock frequency can be derivedfrom an on-chip RC oscillator or an external clock. Calculation of the frequency is based on the system frequencysources as stated above. It is recommended that the host controller should initialize the HT1632C afterpower on reset, for power on reset may fail, which in turn leads to the malfunction of the HT1632CRev. 1.20 22 June 28, 2011