The product is Huawei MateX2 foldable screen phone, which uses the Kirin 9000E chip, built-in 8GB+256GB/512GB storage, equipped with 6.45-inch outer screen and 7.6-inch inner screen, supports 120Hz refresh rate, and is equipped with a 5000mAh battery, supports 66W wired fast charging and 55W wireless fast charging
The ST16C554 series is a universal asynchronous receiver‑transmitter (UART) offering a dual‑footprint interface and enhanced functionality. It provides 16‑byte transmit and receive FIFOs, up to 1.5 Mbps data rates, independent transmit/receive control, a software‑selectable baud‑rate generator, four selectable FIFO interrupt trigger levels, and a standard modem interface. The devices are offered in 64‑pin TQFP and 68‑pin PLCC packages, with the 68‑pin version supporting both 16‑mode (Intel) and 68‑mode (Motorola) bus interfaces.
The datasheet includes detailed pin descriptions, block diagrams for both 16‑mode and 68‑mode operation, ordering information with temperature ranges, mechanical dimensions for the PLCC carrier, and legal notices. Compatibility with industry‑standard UARTs such as ST16C454, ST68C454, ST68C554 and TL16C554 is also listed.
| Maximum data rate | 1.5 Mbps |
|---|---|
| Transmit FIFO size | 16 bytes |
| Receive FIFO size | 16 bytes with error flags |
| Operating temperature (ST16C554DCJ68) | -0 °C to +70 °C |
| Operating temperature (ST16C554DIN68) | 40 °C to +85 °C |
| Baud‑rate generator | Software selectable |
| Interrupt trigger levels | Four selectable receive FIFO levels |
| Modem interface | Standard modem interface |
| Compatibility | ST16C454, ST68C454, ST68C554, TL16C554 |
The device supports up to 1.5 Mbps transmit and receive operation.
Both transmit and receive FIFOs are 16 bytes deep, with error flags on the receive side.