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ST16C552IJ68 bảng dữ liệu(PDF) 9 Page - Exar Corporation |
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ST16C552IJ68 bảng dữ liệu(HTML) 9 Page - Exar Corporation |
9 / 39 page 9 ST16C552/552A Rev. 3.40 The rich feature set of the 552/552A is available through internal registers. Selectable receive FIFO trigger levels, selectable TX and RX baud rates, modem interface controls, and a power-down mode are all standard features. Following a power on reset or an external reset, the 552/552A is software compat- ible with the previous generation, 16C452. FUNCTIONAL DESCRIPTIONS Functional Modes Two functional user modes are selectable for the 552/ 552A 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 552/552A 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 552/552A 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 552/552A provides 12 internal registers for monitor- ing 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), a FIFO control register (FCR), 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 register (SR), I/O select register (IOSEL), and a command and control register (COM/CON). Register functions are more fully de- scribed in the following paragraphs. |
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Mô tả tương tự - ST16C552IJ68 |
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