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TS68230 数据表(PDF) 1 Page - STMicroelectronics |
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TS68230 数据表(HTML) 1 Page - STMicroelectronics |
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1 / 61 page  TS68230 January 1989 HMOS PARALLEL INTERFACE/TIMER . 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 DIRECT- LY ADDRESSABLE . REGISTERS ARE ADDRESSED FOR MOVEP (Move Peripheral) AND DMAC COMPATIBILITY 1 P (PDIP48) FN (PLCC52) PIN CONNECTIONS DESCRIPTION The TS68230 parallel interface/timer (PI/T) provides versatile double buffered parallel interfaces and a system oriented timer for TS68000 systems. The pa- rallel interfaces operate in unidirectional or bidirectio- nal modes, either 8 or 16 bits wide. In the unidirectional 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 auto-vectored 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. 1/61 |
类似零件编号 - TS68230 |
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类似说明 - TS68230 |
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