Overview
C165H is a new low cost member of the Infineon Communication Controller family using low power CMOS technology. The device combines the successful Infineon C166 16-bit full-static core with four independent HDLC controllers, IOM-2 interface and 3-kbyte of Dual-Port on-chip RAM to a Intelligent Terminal Adapter with HDLC support.
C165H adresses all high feature ISDN TA, Intelligent NT or SOHO PBX designs, offering up to 18 MIPS along with legacy peripherals such as USART, SCI and Timers.

C165H provides:
• On-Chip full-static C166 Core supporting a 16- or 8-bit C16x Family System running
up to 36 MHz
• ISDN BRI supporting data rates of 56 kbit/s, 64 kbit/s, 128 kbit/s and 144 kbit/s
• IOM-2/PCM Interface
– Terminal Mode Type Interface to CODEC and S/U Transceiver
– Linecard Mode Type Interface up to 8 IOM-2 channels or 32 PCM channels
– 1536/786 kHz and 1536 kHz...4096 kHz in 512 kHz steps
– Access to two Intercommunication channels (IC1, IC2)
– Access to two MON channels (MON0, MON1)
– Access to two C/I channels (CI0, CI1)
– S/G access support
• Four On-Chip Independent Full-Duplex HDLC Formatters
– 8 independent 8-byte FIFOs for each transmit and receive channel
• USART Interface with AutoBaud Support (1,200 bit/s - 230,400 bit/s)
– AT-Command sensitive AutoBaud Detection