HPC46400E Datasheet | National Semiconductor

Description The HPC46400E is an upgraded HPC16400 Features have been added to support V 120 the 8-bit mode has been enhanced to support all instructions and the UART has been changed to provide more flexibility and power The HPC46400E is fully upward patible with the HPC16400 The HPC46400E has 4 functional blocks to support a wide range of munication application-2 HDLC channels 4 channel DMA controller to facilitate data flow for the HDLC channels programmable serial interface and UART The serial interface decoder allows the 2 HDLC channels to be used with devices using interchip serial link for point-topoint and multipoint data exchanges The decoder generates enable signals for the HDLC channels allowing multiplexed D and B channel data to be accessed The HDLC channels manage the link by providing sequencing using the HDLC framing along with error control based upon a cyclic redundancy check (CRC) Multiple address recognition modes and both bit and byte modes of operation are supported The HPC36400E and HPC46400E are available in 68-pin PLCC and 80-pin PQFP packages Features HPCTM family core features 16-bit data bus ALU and registers 64 kbytes of external memory addressing FAST 20 0 MHz system clock Four 16-bit timer counters with WATCHDOGTM logic MICROWIRE PLUSTM serial I O interface CMOS low power with two power save modes Two full duplex HDLC channels Optimized for ISDN X 25 V 120 and LAPD applications Programmable frame address recognition Up to 4 65 Mbps serial data rate Built in diagnostics Synchronous bypass mode Optional CRC generation Received CRC bytes can be read by the CPU Four channel DMA controller 8- or 16-bit external data bus UART Full duplex 7 8 or 9 data bits Even odd mark space or no parity 7 8 1 or 2 stop bit generation Accurate internal baud rate generation up to 625k baud without penalty of using expensive crystal Synchronous and asynchronous modes of operation Serial Decoder Supports 6 popular time division...