The modem is designed to operate with dial-up telephone lines in the U.S. and world-wide. PC Card interface models also support analog cellular direct connect and GSM direct connect. Parallel host interface models can support either analog cellular direct connect and GSM direct connect or telephony extensions. Serial DTE interface models support telephony extensions. Low profile, small PQFP/TQFP packages and low voltage operation with low power consumption make this device set ideal for laptop, notebook, and palmtop applications using parallel host or serial DTE interface with the MCU or using PC Card interface with the MCUP. The device set consists of an 8-bit microcomputer (MCU) or MCU with built-in PC Card interface (MCUP) in a 128pin TQFP and a modem data pump (MDP) in a 144-pin TQFP or 100-pin PQFP. The SP model can also be ordered with an RCDSVD Speech Codec Processor (SCP) in a 100-pin PQFP to support DSVD. The MCUP PC Card interface supports two peripheral channels, one channel for the modem and a second channel for an optional user-defined function (Function 2). Downloadable architecture supports downloading of modem firmware from the host/DTE to the MCU and, transparently to the host/DTE, the downloading of MDP code modules from the MCU.