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ST16C2550IJ44 Scheda tecnica(PDF) 4 Page - Exar Corporation |
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ST16C2550IJ44 Scheda tecnica(HTML) 4 Page - Exar Corporation |
4 / 34 page ST16C2550 4 Rev. 3.20 SYMBOL DESCRIPTION Symbol Pin Signal Pin Description 40 44 48 type A0 28 31 28 I Address-0 Select Bit. - Internal register address selection. A1 27 30 27 I Address-1 Select Bit. - Internal register address selection. A2 26 29 26 I Address-2 Select Bit. - Internal register address selection. -CS A-B 14,15 16,17 10,11 I Chip Select A, B (active low) - This function is associated with individual channels, A through B. These pins enable data transfers between the user CPU and the 2550 for the channel(s) addressed. Individual UART sections (A, B) are addressed by providing a logic 0 on the respective -CS A- B pin. D0-D7 1-8 2-9 44-48 I/O 1-3 Data Bus (Bi-directional) - These pins are the eight bit, three state data bus for transferring information to or from the controlling CPU. D0 is the least significant bit and the first data bit in a transmit or receive serial data stream. GND 20 22 17 Pwr Signal and power ground. INT A-B 30,29 33,32 30,29 O Interrupt A, B (three state) - This function is associated with individual channel interrupts, INT A-B. INT A-B are enabled when MCR bit-3 is set to a logic 1, interrupts are enabled in the interrupt enable register (IER), and when an interrupt condition exists. Interrupt conditions include: receiver er- rors, available receiver buffer data, transmit buffer empty, or when a modem status flag is detected. -IOR 21 24 19 I Read strobe. (active low Strobe) - A logic 0 transition on this pin will load the contents of an Internal register defined by address bits A0-A2 onto the 2550 data bus (D0-D7) for access by an external CPU. -IOW 18 20 15 I Write strobe. (active low strobe) - 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. -OP2 A-B 31,13 35,15 32,9 O Output -2 (User Defined). - This function is associated with |
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