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SC16C554BIB80 Datasheet(PDF) 10 Page - NXP Semiconductors |
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SC16C554BIB80 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 51 page 9397 750 13133 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 01 — 9 February 2005 10 of 51 Philips Semiconductors SC16C554B/554DB 5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 16-byte FIFOs D0 to D2, D3 to D7 66 to 68, 1to5 53 to 55, 56 to 60 7to9, 11 to 15 I/O Data bus (bi-directional). These pins are the 8-bit, 3-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. DSRA, DSRB, DSRC, DSRD 10, 26, 44, 60 1, 17, 32, 48 22, 39, 62, 79 I Data Set Ready (active LOW). These inputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates the modem or data set is powered-on and is ready for data exchange with the UART. This pin has no effect on the UART’s transmit or receive operation. DTRA, DTRB, DTRC, DTRD 12, 24, 46, 58 3, 15, 34, 46 24, 37, 64, 77 O Data Terminal Ready (active LOW). These outputs are associated with individual UART channels, A through D. A logic 0 on this pin indicates that the SC16C554B/554DB is powered-on and ready. This pin can be controlled via the modem control register. Writing a logic 1 to MCR[0] will set the DTR output to logic 0, enabling the modem. This pin will be a logic 1 after writing a logic 0 to MCR[0], or after a reset. This pin has no effect on the UART’s transmit or receive operation. GND 6, 23, 40, 57 14, 28, 45, 61 16, 36, 56, 76 I Signal and power ground. INTA, INTB, INTC, INTD 15, 21, 49, 55 6, 12, 37, 43 27, 34, 67, 74 O Interrupt A, B, C, D (active HIGH). This function is associated with the 16 mode only. These pins provide individual channel interrupts INTA to INTD. INTA to INTD are enabled when MCR[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 errors, available receiver buffer data, transmit buffer empty, or when a modem status flag is detected. When the 68 mode is selected, the functions of these pins are re-assigned. 68 mode functions are described under their respective name/pin headings. INTSEL 65 - 6 I Interrupt Select (active HIGH, with internal pull-down). This function is associated with the 16 mode only. When the 16 mode is selected, this pin can be used in conjunction with MCR[3] to enable or disable the 3-state interrupts, INTA to INTD, or override MCR[3] and force continuous interrupts. Interrupt outputs are enabled continuously by making this pin a logic 1. Making this pin a logic 0 allows MCR[3] to control the 3-state interrupt output. In this mode, MCR[3] is set to a logic 1 to enable the 3-state outputs. This pin is disabled in the 68 mode. Due to pin limitations on the 64-pin packages, this pin is not available. To cover this limitation, the SC16C554DBIB64 version operates in the continuous interrupt enable mode by bonding this pin to VCC internally. The SC16C554BIB64 operates with MCR[3] control by bonding this pin to GND. IOR 52 40 70 I Input/Output Read strobe (active LOW). This function is associated 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 to A2 onto the SC16C554B/554DB data bus (D0 to D7) for access by external CPU. This pin is disabled in the 68 mode. Table 2: Pin description …continued Symbol Pin Type Description PLCC68 LQFP64 LQFP80 |
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