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S3C72B5 Datasheet(PDF) 7 Page - Samsung semiconductor |
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S3C72B5 Datasheet(HTML) 7 Page - Samsung semiconductor |
7 / 37 page S3C72B5/C72B7/C72B9/P72B9 PRODUCT OVERVIEW 1-7 SERIAL I/O INTERFACE The serial I/O interface supports the transmission or reception of 8-bit serial data with an external device. The serial interface has the following functional components: — 8-bit mode register — Clock selector circuit — 8-bit buffer register — 3-bit serial clock counter The serial I/O circuit can be set either to transmit-and-receive or to receive-only mode. MSB-first or LSB-first transmission is also selectable. The serial interface operates with an internal or an external clock source, or using the clock signal generated by the 16-bit timer/counter. To modify transmission frequency, the appropriate bits in the serial I/O mode register (SMOD) must be manipulated. COMPARATOR Port 4 can be used as a analog input port for a comparator. The reference voltage for the 3-channel comparator can be supplied either internally or externally at P4.2. The comparator module has the following components: — Comparator — Internal reference voltage generator (4-bit resolution) — External reference voltage source at P4.2 — Comparator mode register (CMOD) — Comparison result register (CMPREG) |
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