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ST16C554DIJ68 데이터시트(PDF) 7 Page - Exar Corporation |
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ST16C554DIJ68 데이터시트(HTML) 7 Page - Exar Corporation |
7 / 40 page ST16C554/554D/68C554 7 Rev. 3.10 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 68 64 type pin a logic 1. Making this pin a logic 0 allows MCR bit-3 to control the three state interrupt output. In this mode, MCR bit-3 is set to a logic 1 to enable the three state outputs. This pin is disabled in the 68 mode. Due to pin limitations on 64 pin packages, this pin is not available. To cover this limitation, two 64 pin QFP package versions are offered. The ST16C554DCQ64 operates in the continuos interrupt enable mode by bonded this pin to VCC internally. The ST16C554CQ64 operates with MCR bit-3 control by bond- ing this pin to GND. -IOR 52 40 I Read strobe. (active low Strobe) - This function is associ- ated with the 16 mode only. A logic 0 transition on this pin will load the contents of an Internal register defined by address bits A0-A2 onto the ST16C554D data bus (D0-D7) for access by an external CPU. This pin is disabled in the 68 mode. -IOW 18 9 I Write strobe. (active low strobe) - This function is associ- ated with the 16 mode only. A logic 0 transition on this pin will transfer the contents of the data bus (D0-D7) from the external CPU to an internal register that is defined by address bits A0/A2. When the 16 mode is selected, this pin functions as -R/W, see definition under R/W. -IRQ 15 - O Interrupt Request or Interrupt A - This function is associ- ated with the 68 mode only. In the 68 mode, interrupts from UART channels A-D are WIRE-ORed internally to function as a single IRQ interrupt. This pin transitions to a logic 0 (if enabled by the interrupt enable register) whenever a UART channel(s) requires service. Individual channel interrupt status can be determined by addressing each channel through its associated internal register, using -CS and A3- A4. In the 68 mode an external pull-up resistor must be connected between this pin and VCC. The function of this pin changes to INTA when operating in the 16 mode, see definition under INTA. |
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