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TS68230CFN10 データシート(PDF) 2 Page - STMicroelectronics |
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TS68230CFN10 データシート(HTML) 2 Page - STMicroelectronics |
2 / 61 page INTRODUCTION The TS68230 parallel interface/timer (PI/T) provides versatile double buffered parallel interfaces and a system oriented timer for TS68000 systems. The parallel interfaces operate in unidirectional or bidi- rectional modes, either 8 or 16 bits wide. In the uni- directional modes, an associated data direction register determines whether each port pin is an input or output. In the bidirectional modes the data direc- tion registers are ignored and the direction is deter- mined dynamically by the state of four handshake pins. These programmable handshake pins provide an interface flexible enough for connection to a wide variety of low, medium, or high speed peripherals or other computer systems. The PI/T ports allow use of vectored or autovectored interrupts, and also pro- vide a DMA request pin for connection to the 68440 direct memory access controller (DMAC) or a similar circuit. The PI/T timer contains a 24-bit wide counter and a 5-bit prescaler. The timer may be clocked by the system clock (PI/T CLK pin) or by an external clock (TIN pin), and a 5-bit prescaler can be used. It can generate periodic interrupts, a square wave, or a single interrupt after a programmed time period. It can also be used for elapsed time measurement or as a device watchdog. Features of the PI/T include : . TS68000 Bus Compatible . Port Modes Include : Bit I/O Unidirectional 8 Bit and 16 Bit Bidirectional 8 Bit and 16 Bit . Programmable Handshaking Options . 24-Bit Programmable Timer Modes . Five Separate Interrupt Vectors . Separate Port and Timer Interrupt Service Requests . Registers are Read/Write and Directly Addressable . Registers are Addressed for MOVEP (Move Peripheral) and DMAC Compatibility The PI/T consists of two logically independent sec- tions : the ports and the timer. The port section consists of port A (PA0-PA7), port B (PB0-PB7), four handshake pins (H1, H2, H3, and H4), two general input/output (I/O) pins, and six dual-function pins. The dual-function pins can individually operate as a third port (port C) or an alternate function related to either port A, port B, or the timer. The four program- mable handshake pins, depending on the mode, can control data transfer to and from the ports, or can be used as interrupt generating inputs or I/O pins. Refer to figure 1.1. The timer consists of a 24-bit counter, optionally clocked by a 5-bit prescaler. Three pins provide complete timer I/O : PC2/TIN, PC3/TOUT, and PC7/TIACK. Only the ones needed for the given configuration perform the timer function, while the o- thers remain port C I/O. The system bus interface provides for asynchro- nous transfer of data from the PI/T to a bus master over the data bus (D0-D7). Data transfer acknow- ledge (DTACK), register selects (RS1-RS5), timer interrupt acknowledge (TIACK), read/write line (R/W), chip select (CS), or port interrupt acknow- ledge (PIACK) control data transfer between the PI/T and an TS68000. 1.1. PORT MODE DESCRIPTION The primary focus of most applications will be on port A, port B, the handshake pins, the port interrupt pins, and the DMA request pin. They are controlled in the following way : the port general control register contains a 2-bit field that specifies one of four ope- ration modes. These govern the overall operation of the ports and determine their interrelation-ships. Some modes require additional information from each port’s control register to further define its ope- ration. In each port control register, there is a 2-bit submode field that serves this purpose. Each port mode/submode combination specifies a set of pro- grammable characteristics that fully define the be- havior of that port and two of the handshake pins. This structure is summarized in table 1.1 and fig- ure 1.2. SECTION 1 TS68230 2/61 |
同様の部品番号 - TS68230CFN10 |
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同様の説明 - TS68230CFN10 |
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