Started by FranzPeter, August 23, 2022, 02:12:18 pm
Quote from: undefined6.10.2 Subaddress counterThe storage of display data is determined by the contents of the subaddress counter.Storage is allowed only when the content of the subaddress counter match with thehardware subaddress applied to A0, A1, and A2. The subaddress counter value isdefined by the device-select command (see Table 13). If the content of the subaddresscounter and the hardware subaddress do not match then data storage is inhibited but thedata pointer is incremented as if data storage had taken place. The subaddress counteris also incremented when the data pointer overflows.The storage arrangements described lead to extremely efficient data loading in cascadedapplications. When a series of display bytes are sent to the display RAM, automaticwrap-over to the next PCF8576D occurs when the last RAM address is exceeded.Subaddressing across device boundaries is successful even if the change to the nextdevice in the cascade occurs within a transmitted character.