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ST16C452CJ68 Datasheet(PDF) 8 Page - Exar Corporation |
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ST16C452CJ68 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 30 page 8 ST16C452/452PS Rev. 3.20 GENERAL DESCRIPTION The 452/452PS provides serial asynchronous receive data synchronization, parallel-to-serial and serial-to- parallel data conversions for both the transmitter and receiver sections. These functions are necessary for converting the serial data stream into parallel data that is required with digital data systems. Synchronization for the serial data stream is accomplished by adding start and stops bits to the transmit data to form a data character (character orientated protocol). Data integ- rity is insured by attaching a parity bit to the data character. The parity bit is checked by the receiver for any transmission bit errors. The electronic circuitry to provide all these functions is fairly complex especially when manufactured on a single integrated silicon chip. The 452/452PS represents such an integration with greatly enhanced features. The 452/452PS is fabricated with an advanced CMOS process. The 452/452PS combines the package functions of a dual UART and a printer interface on a single inte- grated chip. The 452/452PS UART is indented to be software compatible with the ST16C450, and NS16C450 while the bi-directional printer interface mode is intended to operate with a CENTRONICS type parallel printer. However, the printer interface is designed such that it may be configured to operate with other parallel printer interfaces or used as a general purpose parallel interface. The 452 is avail- able in two versions, the ST16C452 and the ST16C452PS. The ST16C452 provides single hard- ware pin to control the printer port data direction while the 452PS provides an additionally software control bit to control the printer port data direction to become compatible PS/2 operating system. The 452/452PS is capable of operation to 1.5Mbps with a 24 MHz external clock input. With an external clock input of 1.8432 MHz the user can select data rates up to 115.2 Kbps. FUNCTIONAL DESCRIPTIONS Functional Modes Two functional user modes are selectable for the 452/ 452PS package. The first of these provides the dual UART functions, while the other provides the func- tions of a parallel printer interface. These features are available through selection at the package interface select pins. UART A-B Functions The UART mode provides the user with the capability to transfer information between an external CPU and the 452/452PS package. A logic 0 on chip select pins -CSA or -CSB allows the user to configure, send data, and/or receive data via the UART channels A-B. Printer Port Functions The Printer mode provides the user with the capability to transfer information between an external CPU and the 452/452PS parallel printer port. A logic 0 on chip select pin -CSP allows the user to configure, send data, and/or receive data via the bi-directional parallel 8-bit data bus, PD0-PD7. Internal Registers The 452/452PS provides 11 internal registers for monitoring and control of the UART functions and another 6 registers for monitoring and controlling the printer port. These resisters are shown in Table 4 below. The UART registers function as data holding registers (THR/RHR), interrupt status and control registers (IER/ISR), line status and control registers (LCR/LSR), modem status and control registers (MCR/MSR), programmable data rate (clock) control registers (DLL/DLM), and a user assessable scratchpad register (SPR). The printer port registers functions data holding registers (PR), I/O status regis- ter (SR), I/O select register (IOSEL), and a command and control register (COM/CON). Register functions are more fully described in the following paragraphs. |
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