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TS68HC901CP5 Arkusz danych(PDF) 8 Page - STMicroelectronics |
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TS68HC901CP5 Arkusz danych(HTML) 8 Page - STMicroelectronics |
8 / 42 page interrupt structure is not implemented, the IEI of all CMFPs must be tied low. When the processor initiates an interrupt acknow- ledge cycle by driving IACK and DS, the CMFP whose IEI is low may respond with a vector number if interrupt is pending. If this device does not have a pending interrupt, IEO is asserted which allows the next lower priority device to respond to the interrupt acknowledge. When an CMFP propagates IEO, it will not drive the data bus nor DTACK during the in- terrupt acknowledge cycle. The timing for an IACK cycle is shown in figure 23 and 24. RESET OPERATION The reset operation will initialize the CMFP to a known state. The reset operation requires that the RESET input be asserted for a minimum of two microseconds. During a device reset condition, all internal CMFP registers are cleared except for the timer data registers (TADR, TBDR, TCDR and TDDR), the USART data register (UDR), the trans- mitter status register (TSR) and the interrupt vector register. All timers are stopped and the USART re- ceiver and transmitter are disabled. The interrupt channels are also disabled and any pending inter- rupts are cleared. In addition, the general purpose interrupt I/O lines are placed in the high- impedance input mode and the timer outputs are driven low. Ex- ternal CMFP signals are negated. The interrupt vec- tor register is initialized to a 0Fh. NON MULTIPLEXED MODE In this mode, the MPX input must be set to zero, and the TS68HC901 can be used with a 68000 proces- sor type or a 6800 processor type. Refer to figure 21 to 24 for the electrical characteristics. With a 6800 processor type the DS pin is connected to the E signal of the processor, the DTACK signal is not used and the CLK must be zeroed. MULTIPLEXED MODE The CMFP can be used either on a MOTOROLA or INTEL bus type. In this case the MPX pin is connec- ted to Vcc. The table page 4 gives the signification of the different signals used. A dummy access to the TS68HC901 has to be done before any valid access in order to set up the internal logic of sampling. ® TS68HC901 8/42 |
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