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ST16654 Datasheet(PDF) 10 Page - Exar Corporation |
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ST16654 Datasheet(HTML) 10 Page - Exar Corporation |
10 / 49 page ST16C654/654D 5-74 Rev. 4.10 Symbol Pin Signal Pin Description 68 100 64 type discussed in a following paragraph For 64/68 pin packages, individual channel TX status can be read by examining individual internal registers via -CS and A0-A4 pin func- tions. -TXRDY A-B - 5,25 -TXRDY C-D - 56,81 - O This function is associated with 100 pin packages only. These outputs provide the TX FIFO/THR status for indi- vidual transmit channels (A-D). As such, an individual channel’s -TXRDY A-D buffer ready status is indicated by logic 0, i.e., at least one location is empty and available in the FIFO or THR. This pin goes to a logic 1 when there are no more empty locations in the FIFO or THR. VCC 13 10 4,21 VCC 47,64 61,86 35,52 I Power supply inputs. XTAL1 35 40 25 I Crystal or External Clock Input - Functions as a crystal input or as an external clock input. A crystal can be connected between this pin and XTAL2 to form an internal oscillator circuit (see figure 8). Alternatively, an external clock can be connected to this pin to provide custom data rates (see Baud Rate Generator Programming and optional MIDCLK). XTAL2 36 41 26 O Output of the Crystal Oscillator or Buffered Clock - (See also XTAL1). Crystal oscillator output or buffered clock output. -CD A-B 9,27 99,32 64,18 -CD C-D 43,61 49,83 31,49 I Carrier Detect (active low) - These inputs are associated with individual UART channels A through D. A logic 0 on this pin indicates that a carrier has been detected by the modem for that channel. -CTS A-B 11,25 8,22 2,16 -CTS C-D 45,59 59,73 33,47 I Clear to Send (active low) - These inputs are associated with individual UART channels, A through D. A logic 0 on the - CTS pin indicates the modem or data set is ready to accept transmit data from the 654. Status can be tested by reading MSR bit-4. This pin only affects the transmit and receive operations when Auto CTS function is enabled via the SYMBOL DESCRIPTION |
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